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Hydrograph River at a Glance Download
Big Sioux River above Hawarden Stage (ft)Flow (cfs)Observed: 19.47 ft at 7:00PM May 11, 2018Observed: 19.5 ft at 7:15PM May 11, 2018Observed: 19.5 ft at 7:30PM May 11, 2018Observed: 19.53 ft at 7:45PM May 11, 2018Observed: 19.55 ft at 8:00PM May 11, 2018Observed: 19.57 ft at 8:15PM May 11, 2018Observed: 19.58 ft at 8:30PM May 11, 2018Observed: 19.61 ft at 8:45PM May 11, 2018Observed: 19.63 ft at 9:00PM May 11, 2018Observed: 19.68 ft at 9:15PM May 11, 2018Observed: 19.69 ft at 9:30PM May 11, 2018Observed: 19.72 ft at 9:45PM May 11, 2018Observed: 19.75 ft at 10:00PM May 11, 2018Observed: 19.75 ft at 10:01PM May 11, 2018Observed: 19.76 ft at 10:15PM May 11, 2018Observed: 19.76 ft at 10:16PM May 11, 2018Observed: 19.8 ft at 10:30PM May 11, 2018Observed: 19.8 ft at 10:31PM May 11, 2018Observed: 19.82 ft at 10:45PM May 11, 2018Observed: 19.85 ft at 11:00PM May 11, 2018Observed: 19.89 ft at 11:15PM May 11, 2018Observed: 19.92 ft at 11:30PM May 11, 2018Observed: 19.94 ft at 11:45PM May 11, 2018Observed: 19.99 ft at 12:00AM May 12, 2018Observed: 20.03 ft at 12:15AM May 12, 2018Observed: 20.06 ft at 12:30AM May 12, 2018Observed: 20.09 ft at 12:45AM May 12, 2018Observed: 20.13 ft at 1:00AM May 12, 2018Observed: 20.15 ft at 1:15AM May 12, 2018Observed: 20.18 ft at 1:30AM May 12, 2018Observed: 20.21 ft at 1:45AM May 12, 2018Observed: 20.25 ft at 2:00AM May 12, 2018Observed: 20.31 ft at 2:15AM May 12, 2018Observed: 20.31 ft at 2:30AM May 12, 2018Observed: 20.35 ft at 2:45AM May 12, 2018Observed: 20.39 ft at 3:00AM May 12, 2018Observed: 20.4 ft at 3:15AM May 12, 2018Observed: 20.46 ft at 3:30AM May 12, 2018Observed: 20.49 ft at 3:45AM May 12, 2018Observed: 20.53 ft at 4:00AM May 12, 2018Observed: 20.55 ft at 4:15AM May 12, 2018Observed: 20.61 ft at 4:30AM May 12, 2018Observed: 20.63 ft at 4:45AM May 12, 2018Observed: 20.69 ft at 5:00AM May 12, 2018Observed: 20.69 ft at 5:15AM May 12, 2018Observed: 20.73 ft at 5:30AM May 12, 2018Observed: 20.74 ft at 5:45AM May 12, 2018Observed: 20.78 ft at 6:00AM May 12, 2018Observed: 20.78 ft at 6:01AM May 12, 2018Observed: 20.8 ft at 6:15AM May 12, 2018Observed: 20.8 ft at 6:16AM May 12, 2018Observed: 20.84 ft at 6:30AM May 12, 2018Observed: 20.84 ft at 6:31AM May 12, 2018Observed: 20.88 ft at 6:45AM May 12, 2018Observed: 20.9 ft at 7:00AM May 12, 2018Observed: 20.92 ft at 7:15AM May 12, 2018Observed: 20.95 ft at 7:30AM May 12, 2018Observed: 20.97 ft at 7:45AM May 12, 2018Observed: 21.01 ft at 8:00AM May 12, 2018Observed: 21.04 ft at 8:15AM May 12, 2018Observed: 21.04 ft at 8:30AM May 12, 2018Observed: 21.08 ft at 8:45AM May 12, 2018Observed: 21.09 ft at 9:00AM May 12, 2018Observed: 21.13 ft at 9:15AM May 12, 2018Observed: 21.14 ft at 9:30AM May 12, 2018Observed: 21.15 ft at 9:45AM May 12, 2018Observed: 21.18 ft at 10:00AM May 12, 2018Observed: 21.21 ft at 10:15AM May 12, 2018Observed: 21.23 ft at 10:30AM May 12, 2018Observed: 21.24 ft at 10:45AM May 12, 2018Observed: 21.26 ft at 11:00AM May 12, 2018Observed: 21.27 ft at 11:15AM May 12, 2018Observed: 21.31 ft at 11:30AM May 12, 2018Observed: 21.34 ft at 11:45AM May 12, 2018Observed: 21.34 ft at 12:00PM May 12, 2018Observed: 21.36 ft at 12:15PM May 12, 2018Observed: 21.36 ft at 12:30PM May 12, 2018Observed: 21.38 ft at 12:45PM May 12, 2018Observed: 21.42 ft at 1:00PM May 12, 2018Observed: 21.42 ft at 1:15PM May 12, 2018Observed: 21.4 ft at 1:30PM May 12, 2018Observed: 21.42 ft at 1:45PM May 12, 2018Observed: 21.47 ft at 2:00PM May 12, 2018Observed: 21.47 ft at 2:15PM May 12, 2018Observed: 21.49 ft at 2:30PM May 12, 2018Observed: 21.52 ft at 2:45PM May 12, 2018Observed: 21.52 ft at 3:00PM May 12, 2018Observed: 21.52 ft at 3:15PM May 12, 2018Observed: 21.52 ft at 3:30PM May 12, 2018Observed: 21.52 ft at 3:45PM May 12, 2018Observed: 21.55 ft at 4:00PM May 12, 2018Observed: 21.56 ft at 4:15PM May 12, 2018Observed: 21.55 ft at 4:30PM May 12, 2018Observed: 21.57 ft at 4:45PM May 12, 2018Observed: 21.58 ft at 5:00PM May 12, 2018Observed: 21.6 ft at 5:15PM May 12, 2018Observed: 21.59 ft at 5:30PM May 12, 2018Observed: 21.62 ft at 5:45PM May 12, 2018Observed: 21.61 ft at 6:00PM May 12, 2018Observed: 21.63 ft at 6:15PM May 12, 2018Observed: 21.65 ft at 6:30PM May 12, 2018Observed: 21.67 ft at 6:45PM May 12, 2018Observed: 21.67 ft at 7:00PM May 12, 2018Observed: 21.67 ft at 7:15PM May 12, 2018Observed: 21.67 ft at 7:30PM May 12, 2018Observed: 21.67 ft at 7:45PM May 12, 2018Observed: 21.69 ft at 8:00PM May 12, 2018Observed: 21.69 ft at 8:15PM May 12, 2018Observed: 21.69 ft at 8:30PM May 12, 2018Observed: 21.71 ft at 8:45PM May 12, 2018Observed: 21.7 ft at 9:00PM May 12, 2018Observed: 21.71 ft at 9:15PM May 12, 2018Observed: 21.72 ft at 9:30PM May 12, 2018Observed: 21.72 ft at 9:45PM May 12, 2018Observed: 21.72 ft at 10:00PM May 12, 2018Observed: 21.72 ft at 10:01PM May 12, 2018Observed: 21.74 ft at 10:15PM May 12, 2018Observed: 21.74 ft at 10:16PM May 12, 2018Observed: 21.71 ft at 10:30PM May 12, 2018Observed: 21.71 ft at 10:31PM May 12, 2018Observed: 21.74 ft at 10:45PM May 12, 2018Observed: 21.73 ft at 11:00PM May 12, 2018Observed: 21.73 ft at 11:15PM May 12, 2018Observed: 21.74 ft at 11:30PM May 12, 2018Observed: 21.75 ft at 11:45PM May 12, 2018Observed: 21.74 ft at 12:00AM May 13, 2018Observed: 21.76 ft at 12:15AM May 13, 2018Observed: 21.76 ft at 12:30AM May 13, 2018Observed: 21.77 ft at 12:45AM May 13, 2018Observed: 21.76 ft at 1:00AM May 13, 2018Observed: 21.76 ft at 1:15AM May 13, 2018Observed: 21.75 ft at 1:30AM May 13, 2018Observed: 21.77 ft at 1:45AM May 13, 2018Observed: 21.78 ft at 2:00AM May 13, 2018Observed: 21.78 ft at 2:15AM May 13, 2018Observed: 21.77 ft at 2:30AM May 13, 2018Observed: 21.8 ft at 2:45AM May 13, 2018Observed: 21.79 ft at 3:00AM May 13, 2018Observed: 21.78 ft at 3:15AM May 13, 2018Observed: 21.78 ft at 3:30AM May 13, 2018Observed: 21.78 ft at 3:45AM May 13, 2018Observed: 21.79 ft at 4:00AM May 13, 2018Observed: 21.76 ft at 4:15AM May 13, 2018Observed: 21.78 ft at 4:30AM May 13, 2018Observed: 21.79 ft at 4:45AM May 13, 2018Observed: 21.8 ft at 5:00AM May 13, 2018Observed: 21.79 ft at 5:15AM May 13, 2018Observed: 21.78 ft at 5:30AM May 13, 2018Observed: 21.79 ft at 5:45AM May 13, 2018Observed: 21.81 ft at 6:00AM May 13, 2018Observed: 21.8 ft at 6:15AM May 13, 2018Observed: 21.79 ft at 6:30AM May 13, 2018Observed: 21.8 ft at 6:45AM May 13, 2018Observed: 21.77 ft at 7:00AM May 13, 2018Observed: 21.78 ft at 7:15AM May 13, 2018Observed: 21.8 ft at 7:30AM May 13, 2018Observed: 21.8 ft at 7:45AM May 13, 2018Observed: 21.78 ft at 8:00AM May 13, 2018Observed: 21.79 ft at 8:15AM May 13, 2018Observed: 21.77 ft at 8:30AM May 13, 2018Observed: 21.8 ft at 8:45AM May 13, 2018Highest Observation: 21.82 ft at 9:00AM May 13, 2018Observed: 21.8 ft at 9:15AM May 13, 2018Observed: 21.8 ft at 9:30AM May 13, 2018Observed: 21.79 ft at 9:45AM May 13, 2018Observed: 21.78 ft at 10:00AM May 13, 2018Observed: 21.76 ft at 10:15AM May 13, 2018Observed: 21.8 ft at 10:30AM May 13, 2018Observed: 21.77 ft at 10:45AM May 13, 2018Observed: 21.76 ft at 11:00AM May 13, 2018Observed: 21.77 ft at 11:15AM May 13, 2018Observed: 21.78 ft at 11:30AM May 13, 2018Observed: 21.77 ft at 11:45AM May 13, 2018Observed: 21.78 ft at 12:00PM May 13, 2018Observed: 21.77 ft at 12:15PM May 13, 2018Observed: 21.77 ft at 12:30PM May 13, 2018Observed: 21.8 ft at 12:45PM May 13, 2018Observed: 21.76 ft at 1:00PM May 13, 2018Observed: 21.74 ft at 1:15PM May 13, 2018Observed: 21.74 ft at 1:30PM May 13, 2018Observed: 21.75 ft at 1:45PM May 13, 2018Observed: 21.77 ft at 2:00PM May 13, 2018Observed: 21.77 ft at 2:02PM May 13, 2018Observed: 21.75 ft at 2:15PM May 13, 2018Observed: 21.75 ft at 2:17PM May 13, 2018Observed: 21.74 ft at 2:30PM May 13, 2018Observed: 21.74 ft at 2:32PM May 13, 2018Observed: 21.76 ft at 2:45PM May 13, 2018Observed: 21.75 ft at 3:00PM May 13, 2018Observed: 21.73 ft at 3:15PM May 13, 2018Observed: 21.73 ft at 3:30PM May 13, 2018Observed: 21.72 ft at 3:45PM May 13, 2018Observed: 21.72 ft at 4:00PM May 13, 2018Observed: 21.7 ft at 4:15PM May 13, 2018Observed: 21.71 ft at 4:30PM May 13, 2018Observed: 21.69 ft at 4:45PM May 13, 2018Observed: 21.7 ft at 5:00PM May 13, 2018Observed: 21.69 ft at 5:15PM May 13, 2018Observed: 21.69 ft at 5:30PM May 13, 2018Observed: 21.66 ft at 5:45PM May 13, 2018Observed: 21.64 ft at 6:00PM May 13, 2018Observed: 21.66 ft at 6:15PM May 13, 2018Observed: 21.66 ft at 6:30PM May 13, 2018Observed: 21.66 ft at 6:45PM May 13, 2018Observed: 21.63 ft at 7:00PM May 13, 2018Observed: 21.65 ft at 7:15PM May 13, 2018Observed: 21.65 ft at 7:30PM May 13, 2018Observed: 21.62 ft at 7:45PM May 13, 2018Observed: 21.62 ft at 8:00PM May 13, 2018Observed: 21.59 ft at 8:15PM May 13, 2018Observed: 21.59 ft at 8:30PM May 13, 2018Observed: 21.6 ft at 8:45PM May 13, 2018Observed: 21.58 ft at 9:00PM May 13, 2018Observed: 21.57 ft at 9:15PM May 13, 2018Observed: 21.56 ft at 9:30PM May 13, 2018Observed: 21.53 ft at 9:45PM May 13, 2018Observed: 21.53 ft at 10:00PM May 13, 2018Observed: 21.53 ft at 10:01PM May 13, 2018Observed: 21.55 ft at 10:15PM May 13, 2018Observed: 21.55 ft at 10:16PM May 13, 2018Observed: 21.53 ft at 10:30PM May 13, 2018Observed: 21.53 ft at 10:31PM May 13, 2018Observed: 21.5 ft at 10:45PM May 13, 2018Observed: 21.51 ft at 11:00PM May 13, 2018Observed: 21.51 ft at 11:15PM May 13, 2018Observed: 21.5 ft at 11:30PM May 13, 2018Observed: 21.47 ft at 11:45PM May 13, 2018Observed: 21.47 ft at 12:00AM May 14, 2018Observed: 21.43 ft at 12:15AM May 14, 2018Observed: 21.43 ft at 12:30AM May 14, 2018Observed: 21.43 ft at 12:45AM May 14, 2018Observed: 21.42 ft at 1:00AM May 14, 2018Observed: 21.4 ft at 1:15AM May 14, 2018Observed: 21.39 ft at 1:30AM May 14, 2018Observed: 21.41 ft at 1:45AM May 14, 2018Observed: 21.39 ft at 2:00AM May 14, 2018Observed: 21.37 ft at 2:15AM May 14, 2018Observed: 21.38 ft at 2:30AM May 14, 2018Observed: 21.36 ft at 2:45AM May 14, 2018Observed: 21.36 ft at 3:00AM May 14, 2018Observed: 21.34 ft at 3:15AM May 14, 2018Observed: 21.34 ft at 3:30AM May 14, 2018Observed: 21.33 ft at 3:45AM May 14, 2018Observed: 21.31 ft at 4:00AM May 14, 2018Observed: 21.31 ft at 4:15AM May 14, 2018Observed: 21.3 ft at 4:30AM May 14, 2018Observed: 21.28 ft at 4:45AM May 14, 2018Observed: 21.29 ft at 5:00AM May 14, 2018Observed: 21.26 ft at 5:15AM May 14, 2018Observed: 21.25 ft at 5:30AM May 14, 2018Observed: 21.25 ft at 5:45AM May 14, 2018Observed: 21.24 ft at 6:00AM May 14, 2018Observed: 21.19 ft at 6:15AM May 14, 2018Observed: 21.19 ft at 6:17AM May 14, 2018Observed: 21.23 ft at 6:30AM May 14, 2018Observed: 21.23 ft at 6:32AM May 14, 2018Observed: 21.23 ft at 6:45AM May 14, 2018Observed: 21.23 ft at 6:47AM May 14, 2018Observed: 21.21 ft at 7:00AM May 14, 2018Observed: 21.22 ft at 7:15AM May 14, 2018Observed: 21.2 ft at 7:30AM May 14, 2018Observed: 21.17 ft at 7:45AM May 14, 2018Observed: 21.2 ft at 8:00AM May 14, 2018Observed: 21.18 ft at 8:15AM May 14, 2018Observed: 21.17 ft at 8:30AM May 14, 2018Observed: 21.15 ft at 8:45AM May 14, 2018Observed: 21.13 ft at 9:00AM May 14, 2018Observed: 21.12 ft at 9:15AM May 14, 2018Observed: 21.13 ft at 9:30AM May 14, 2018Observed: 21.11 ft at 9:45AM May 14, 2018Observed: 21.12 ft at 10:00AM May 14, 2018Observed: 21.08 ft at 10:15AM May 14, 2018Observed: 21.09 ft at 10:30AM May 14, 2018Observed: 21.08 ft at 10:45AM May 14, 2018Observed: 21.05 ft at 11:00AM May 14, 2018Observed: 21.06 ft at 11:15AM May 14, 2018Observed: 21.06 ft at 11:30AM May 14, 2018Observed: 21.06 ft at 11:45AM May 14, 2018Observed: 21.05 ft at 12:00PM May 14, 2018Observed: 21.05 ft at 12:15PM May 14, 2018Observed: 21.02 ft at 12:30PM May 14, 2018Observed: 21.02 ft at 12:45PM May 14, 2018Observed: 21.01 ft at 1:00PM May 14, 2018Observed: 21 ft at 1:15PM May 14, 2018Observed: 21 ft at 1:30PM May 14, 2018Observed: 20.99 ft at 1:45PM May 14, 2018Observed: 20.99 ft at 2:00PM May 14, 2018Observed: 20.98 ft at 2:15PM May 14, 2018Observed: 20.98 ft at 2:17PM May 14, 2018Observed: 20.97 ft at 2:30PM May 14, 2018Observed: 20.97 ft at 2:32PM May 14, 2018Observed: 20.97 ft at 2:45PM May 14, 2018Observed: 20.97 ft at 2:47PM May 14, 2018Observed: 20.96 ft at 3:00PM May 14, 2018Observed: 20.96 ft at 3:15PM May 14, 2018Observed: 20.98 ft at 3:30PM May 14, 2018Observed: 20.95 ft at 3:45PM May 14, 2018Observed: 20.94 ft at 4:00PM May 14, 2018Observed: 20.94 ft at 4:15PM May 14, 2018Observed: 20.93 ft at 4:30PM May 14, 2018Observed: 20.93 ft at 4:45PM May 14, 2018Observed: 20.91 ft at 5:00PM May 14, 2018Observed: 20.9 ft at 5:15PM May 14, 2018Observed: 20.89 ft at 5:30PM May 14, 2018Observed: 20.89 ft at 5:45PM May 14, 2018Observed: 20.88 ft at 6:00PM May 14, 2018Observed: 20.88 ft at 6:15PM May 14, 2018Observed: 20.88 ft at 6:30PM May 14, 2018Observed: 20.86 ft at 6:45PM May 14, 2018Observed: 20.85 ft at 7:00PM May 14, 2018Observed: 20.85 ft at 7:15PM May 14, 2018Observed: 20.84 ft at 7:30PM May 14, 2018Observed: 20.84 ft at 7:45PM May 14, 2018Observed: 20.83 ft at 8:00PM May 14, 2018Observed: 20.81 ft at 8:15PM May 14, 2018Observed: 20.8 ft at 8:30PM May 14, 2018Observed: 20.81 ft at 8:45PM May 14, 2018Observed: 20.8 ft at 9:00PM May 14, 2018Observed: 20.82 ft at 9:15PM May 14, 2018Observed: 20.8 ft at 9:30PM May 14, 2018Observed: 20.8 ft at 9:45PM May 14, 2018Observed: 20.78 ft at 10:00PM May 14, 2018Observed: 20.78 ft at 10:15PM May 14, 2018Observed: 20.78 ft at 10:16PM May 14, 2018Observed: 20.77 ft at 10:30PM May 14, 2018Observed: 20.77 ft at 10:31PM May 14, 2018Observed: 20.77 ft at 10:45PM May 14, 2018Observed: 20.77 ft at 10:46PM May 14, 2018Observed: 20.77 ft at 11:00PM May 14, 2018Observed: 20.76 ft at 11:15PM May 14, 2018Observed: 20.77 ft at 11:30PM May 14, 2018Observed: 20.75 ft at 11:45PM May 14, 2018Observed: 20.75 ft at 12:00AM May 15, 2018Observed: 20.73 ft at 12:15AM May 15, 2018Observed: 20.71 ft at 12:30AM May 15, 2018Observed: 20.7 ft at 12:45AM May 15, 2018Observed: 20.72 ft at 1:00AM May 15, 2018Observed: 20.71 ft at 1:15AM May 15, 2018Observed: 20.71 ft at 1:30AM May 15, 2018Observed: 20.69 ft at 1:45AM May 15, 2018Observed: 20.68 ft at 2:00AM May 15, 2018Observed: 20.68 ft at 2:15AM May 15, 2018Observed: 20.69 ft at 2:30AM May 15, 2018Observed: 20.67 ft at 2:45AM May 15, 2018Observed: 20.65 ft at 3:00AM May 15, 2018Observed: 20.66 ft at 3:15AM May 15, 2018Observed: 20.65 ft at 3:30AM May 15, 2018Observed: 20.66 ft at 3:45AM May 15, 2018Observed: 20.65 ft at 4:00AM May 15, 2018Observed: 20.66 ft at 4:15AM May 15, 2018Observed: 20.64 ft at 4:30AM May 15, 2018Observed: 20.64 ft at 4:45AM May 15, 2018Observed: 20.63 ft at 5:00AM May 15, 2018Observed: 20.63 ft at 5:15AM May 15, 2018Observed: 20.62 ft at 5:30AM May 15, 2018Observed: 20.6 ft at 5:45AM May 15, 2018Observed: 20.61 ft at 6:00AM May 15, 2018Observed: 20.61 ft at 6:15AM May 15, 2018Observed: 20.61 ft at 6:17AM May 15, 2018Observed: 20.59 ft at 6:30AM May 15, 2018Observed: 20.59 ft at 6:32AM May 15, 2018Observed: 20.59 ft at 6:45AM May 15, 2018Observed: 20.59 ft at 6:47AM May 15, 2018Observed: 20.59 ft at 7:00AM May 15, 2018Observed: 20.58 ft at 7:15AM May 15, 2018Observed: 20.57 ft at 7:30AM May 15, 2018Observed: 20.56 ft at 7:45AM May 15, 2018Observed: 20.57 ft at 8:00AM May 15, 2018Observed: 20.56 ft at 8:15AM May 15, 2018Observed: 20.57 ft at 8:45AM May 15, 2018Observed: 20.56 ft at 9:00AM May 15, 2018Observed: 20.56 ft at 9:15AM May 15, 2018Observed: 20.55 ft at 9:30AM May 15, 2018Observed: 20.55 ft at 9:45AM May 15, 2018Observed: 20.56 ft at 10:00AM May 15, 2018Observed: 20.53 ft at 10:15AM May 15, 2018Observed: 20.52 ft at 10:30AM May 15, 2018Observed: 20.54 ft at 10:45AM May 15, 2018Observed: 20.54 ft at 11:00AM May 15, 2018Observed: 20.53 ft at 11:15AM May 15, 2018Observed: 20.53 ft at 11:30AM May 15, 2018Observed: 20.52 ft at 11:45AM May 15, 2018Observed: 20.52 ft at 12:00PM May 15, 2018Observed: 20.52 ft at 12:15PM May 15, 2018Observed: 20.52 ft at 12:30PM May 15, 2018Observed: 20.51 ft at 12:45PM May 15, 2018Observed: 20.51 ft at 1:00PM May 15, 2018Observed: 20.53 ft at 1:15PM May 15, 2018Observed: 20.5 ft at 1:30PM May 15, 2018Observed: 20.5 ft at 1:45PM May 15, 2018Observed: 20.51 ft at 2:00PM May 15, 2018Observed: 20.49 ft at 2:15PM May 15, 2018Observed: 20.49 ft at 2:16PM May 15, 2018Observed: 20.5 ft at 2:30PM May 15, 2018Observed: 20.5 ft at 2:31PM May 15, 2018Observed: 20.48 ft at 2:45PM May 15, 2018Observed: 20.48 ft at 2:46PM May 15, 2018Observed: 20.49 ft at 3:00PM May 15, 2018Observed: 20.47 ft at 3:15PM May 15, 2018Observed: 20.47 ft at 3:30PM May 15, 2018Observed: 20.47 ft at 3:45PM May 15, 2018Observed: 20.48 ft at 4:00PM May 15, 2018Observed: 20.47 ft at 4:15PM May 15, 2018Observed: 20.48 ft at 4:30PM May 15, 2018Observed: 20.45 ft at 4:45PM May 15, 2018Observed: 20.47 ft at 5:00PM May 15, 2018Observed: 20.47 ft at 5:15PM May 15, 2018Observed: 20.46 ft at 5:30PM May 15, 2018Observed: 20.46 ft at 5:45PM May 15, 2018Observed: 20.47 ft at 6:00PM May 15, 2018Observed: 20.46 ft at 6:15PM May 15, 2018Observed: 20.47 ft at 6:30PM May 15, 2018Observed: 20.45 ft at 6:45PM May 15, 2018Observed: 20.44 ft at 7:00PM May 15, 2018Observed: 20.47 ft at 7:15PM May 15, 2018Observed: 20.42 ft at 7:30PM May 15, 2018Observed: 20.44 ft at 7:45PM May 15, 2018Observed: 20.43 ft at 8:00PM May 15, 2018Observed: 20.43 ft at 8:15PM May 15, 2018Observed: 20.44 ft at 8:30PM May 15, 2018Observed: 20.43 ft at 8:45PM May 15, 2018Observed: 20.43 ft at 9:00PM May 15, 2018Observed: 20.41 ft at 9:15PM May 15, 2018Observed: 20.42 ft at 9:30PM May 15, 2018Observed: 20.41 ft at 9:45PM May 15, 2018Observed: 20.41 ft at 10:00PM May 15, 2018Observed: 20.41 ft at 10:15PM May 15, 2018Observed: 20.41 ft at 10:17PM May 15, 2018Observed: 20.4 ft at 10:30PM May 15, 2018Observed: 20.4 ft at 10:32PM May 15, 2018Observed: 20.41 ft at 10:45PM May 15, 2018Observed: 20.41 ft at 10:47PM May 15, 2018Observed: 20.39 ft at 11:00PM May 15, 2018Observed: 20.4 ft at 11:15PM May 15, 2018Observed: 20.39 ft at 11:30PM May 15, 2018Observed: 20.41 ft at 11:45PM May 15, 2018Observed: 20.4 ft at 12:00AM May 16, 2018Observed: 20.39 ft at 12:15AM May 16, 2018Observed: 20.39 ft at 12:30AM May 16, 2018Observed: 20.37 ft at 12:45AM May 16, 2018Observed: 20.39 ft at 1:00AM May 16, 2018Observed: 20.36 ft at 1:15AM May 16, 2018Observed: 20.34 ft at 1:30AM May 16, 2018Observed: 20.34 ft at 1:45AM May 16, 2018Observed: 20.35 ft at 2:00AM May 16, 2018Observed: 20.35 ft at 2:15AM May 16, 2018Observed: 20.35 ft at 2:30AM May 16, 2018Observed: 20.33 ft at 2:45AM May 16, 2018Observed: 20.34 ft at 3:00AM May 16, 2018Observed: 20.34 ft at 3:15AM May 16, 2018Observed: 20.33 ft at 3:30AM May 16, 2018Observed: 20.32 ft at 3:45AM May 16, 2018Observed: 20.34 ft at 4:00AM May 16, 2018Observed: 20.33 ft at 4:15AM May 16, 2018Observed: 20.31 ft at 4:30AM May 16, 2018Observed: 20.31 ft at 4:45AM May 16, 2018Observed: 20.31 ft at 5:00AM May 16, 2018Observed: 20.3 ft at 5:15AM May 16, 2018Observed: 20.3 ft at 5:30AM May 16, 2018Observed: 20.31 ft at 5:45AM May 16, 2018Observed: 20.31 ft at 6:00AM May 16, 2018Observed: 20.29 ft at 6:15AM May 16, 2018Observed: 20.29 ft at 6:16AM May 16, 2018Observed: 20.3 ft at 6:30AM May 16, 2018Observed: 20.3 ft at 6:31AM May 16, 2018Observed: 20.3 ft at 6:45AM May 16, 2018Observed: 20.3 ft at 6:46AM May 16, 2018Observed: 20.27 ft at 7:00AM May 16, 2018Observed: 20.26 ft at 7:15AM May 16, 2018Observed: 20.3 ft at 7:30AM May 16, 2018Observed: 20.28 ft at 7:45AM May 16, 2018Observed: 20.29 ft at 8:00AM May 16, 2018Observed: 20.29 ft at 8:15AM May 16, 2018Observed: 20.25 ft at 8:30AM May 16, 2018Observed: 20.26 ft at 8:45AM May 16, 2018Observed: 20.26 ft at 9:00AM May 16, 2018Observed: 20.25 ft at 9:15AM May 16, 2018Observed: 20.24 ft at 9:30AM May 16, 2018Observed: 20.23 ft at 9:45AM May 16, 2018Observed: 20.23 ft at 10:00AM May 16, 2018Observed: 20.23 ft at 10:15AM May 16, 2018Observed: 20.24 ft at 10:30AM May 16, 2018Observed: 20.23 ft at 10:45AM May 16, 2018Observed: 20.22 ft at 11:00AM May 16, 2018Observed: 20.23 ft at 11:15AM May 16, 2018Observed: 20.21 ft at 11:30AM May 16, 2018Observed: 20.22 ft at 11:45AM May 16, 2018Observed: 20.21 ft at 12:00PM May 16, 2018Observed: 20.21 ft at 12:15PM May 16, 2018Observed: 20.2 ft at 12:30PM May 16, 2018Observed: 20.18 ft at 12:45PM May 16, 2018Observed: 20.19 ft at 1:00PM May 16, 2018Observed: 20.2 ft at 1:15PM May 16, 2018Observed: 20.19 ft at 1:30PM May 16, 2018Observed: 20.18 ft at 1:45PM May 16, 2018Observed: 20.18 ft at 2:00PM May 16, 2018Observed: 20.19 ft at 2:15PM May 16, 2018Observed: 20.19 ft at 2:16PM May 16, 2018Observed: 20.17 ft at 2:30PM May 16, 2018Observed: 20.17 ft at 2:31PM May 16, 2018Observed: 20.17 ft at 2:45PM May 16, 2018Observed: 20.17 ft at 2:46PM May 16, 2018Observed: 20.16 ft at 3:00PM May 16, 2018Observed: 20.14 ft at 3:15PM May 16, 2018Observed: 20.14 ft at 3:30PM May 16, 2018Observed: 20.14 ft at 3:45PM May 16, 2018Observed: 20.12 ft at 4:00PM May 16, 2018Observed: 20.13 ft at 4:15PM May 16, 2018Observed: 20.11 ft at 4:30PM May 16, 2018Observed: 20.11 ft at 4:45PM May 16, 2018Observed: 20.12 ft at 5:00PM May 16, 2018Observed: 20.11 ft at 5:15PM May 16, 2018Observed: 20.1 ft at 5:30PM May 16, 2018Observed: 20.11 ft at 5:45PM May 16, 2018Observed: 20.11 ft at 6:00PM May 16, 2018Observed: 20.1 ft at 6:15PM May 16, 2018Observed: 20.1 ft at 6:30PM May 16, 2018Observed: 20.09 ft at 6:45PM May 16, 2018Observed: 20.08 ft at 7:00PM May 16, 2018Observed: 20.07 ft at 7:15PM May 16, 2018Observed: 20.07 ft at 7:30PM May 16, 2018Observed: 20.09 ft at 7:45PM May 16, 2018Observed: 20.07 ft at 8:00PM May 16, 2018Observed: 20.08 ft at 8:15PM May 16, 2018Observed: 20.06 ft at 8:30PM May 16, 2018Observed: 20.07 ft at 8:45PM May 16, 2018Observed: 20.06 ft at 9:00PM May 16, 2018Observed: 20.05 ft at 9:15PM May 16, 2018Observed: 20.07 ft at 9:30PM May 16, 2018Observed: 20.04 ft at 9:45PM May 16, 2018Observed: 20.04 ft at 10:00PM May 16, 2018Observed: 20.04 ft at 10:15PM May 16, 2018Observed: 20.04 ft at 10:16PM May 16, 2018Observed: 20.01 ft at 10:30PM May 16, 2018Observed: 20.01 ft at 10:31PM May 16, 2018Observed: 20.01 ft at 10:45PM May 16, 2018Observed: 20.01 ft at 10:46PM May 16, 2018Observed: 20.03 ft at 11:00PM May 16, 2018Observed: 20.01 ft at 11:15PM May 16, 2018Observed: 20.02 ft at 11:30PM May 16, 2018Observed: 19.99 ft at 11:45PM May 16, 2018Observed: 20.01 ft at 12:00AM May 17, 2018Observed: 20 ft at 12:15AM May 17, 2018Observed: 19.97 ft at 12:30AM May 17, 2018Observed: 19.98 ft at 12:45AM May 17, 2018Observed: 19.99 ft at 1:00AM May 17, 2018Observed: 19.97 ft at 1:15AM May 17, 2018Observed: 19.98 ft at 1:30AM May 17, 2018Observed: 19.96 ft at 1:45AM May 17, 2018Observed: 19.96 ft at 2:00AM May 17, 2018Observed: 19.95 ft at 2:15AM May 17, 2018Observed: 19.93 ft at 2:30AM May 17, 2018Observed: 19.96 ft at 2:45AM May 17, 2018Observed: 19.94 ft at 3:00AM May 17, 2018Observed: 19.92 ft at 3:15AM May 17, 2018Observed: 19.93 ft at 3:30AM May 17, 2018Observed: 19.93 ft at 3:45AM May 17, 2018Observed: 19.92 ft at 4:00AM May 17, 2018Observed: 19.91 ft at 4:15AM May 17, 2018Observed: 19.91 ft at 4:30AM May 17, 2018Observed: 19.92 ft at 4:45AM May 17, 2018Observed: 19.9 ft at 5:00AM May 17, 2018Observed: 19.9 ft at 5:15AM May 17, 2018Observed: 19.9 ft at 5:30AM May 17, 2018Observed: 19.87 ft at 5:45AM May 17, 2018Observed: 19.88 ft at 6:00AM May 17, 2018Observed: 19.87 ft at 6:15AM May 17, 2018Observed: 19.86 ft at 6:30AM May 17, 2018Observed: 19.86 ft at 6:31AM May 17, 2018Observed: 19.86 ft at 6:45AM May 17, 2018Observed: 19.86 ft at 6:46AM May 17, 2018Observed: 19.85 ft at 7:00AM May 17, 2018Observed: 19.85 ft at 7:01AM May 17, 2018Observed: 19.84 ft at 7:15AM May 17, 2018Observed: 19.86 ft at 7:30AM May 17, 2018Observed: 19.85 ft at 7:45AM May 17, 2018Observed: 19.84 ft at 8:00AM May 17, 2018Observed: 19.83 ft at 8:15AM May 17, 2018Observed: 19.83 ft at 8:30AM May 17, 2018Observed: 19.84 ft at 8:45AM May 17, 2018Observed: 19.82 ft at 9:00AM May 17, 2018Observed: 19.8 ft at 9:15AM May 17, 2018Observed: 19.8 ft at 9:30AM May 17, 2018Observed: 19.79 ft at 9:45AM May 17, 2018Observed: 19.78 ft at 10:00AM May 17, 2018Observed: 19.79 ft at 10:15AM May 17, 2018Observed: 19.78 ft at 10:30AM May 17, 2018Observed: 19.79 ft at 10:45AM May 17, 2018Observed: 19.76 ft at 11:00AM May 17, 2018Observed: 19.77 ft at 11:15AM May 17, 2018Observed: 19.75 ft at 11:30AM May 17, 2018Observed: 19.73 ft at 11:45AM May 17, 2018Observed: 19.74 ft at 12:00PM May 17, 2018Observed: 19.76 ft at 12:15PM May 17, 2018Observed: 19.74 ft at 12:30PM May 17, 2018Observed: 19.73 ft at 12:45PM May 17, 2018Observed: 19.72 ft at 1:00PM May 17, 2018Observed: 19.72 ft at 1:15PM May 17, 2018Observed: 19.72 ft at 1:30PM May 17, 2018Observed: 19.72 ft at 1:45PM May 17, 2018Observed: 19.72 ft at 2:00PM May 17, 2018Observed: 19.72 ft at 2:15PM May 17, 2018Observed: 19.71 ft at 2:30PM May 17, 2018Observed: 19.71 ft at 2:31PM May 17, 2018Observed: 19.68 ft at 2:45PM May 17, 2018Observed: 19.68 ft at 2:46PM May 17, 2018Observed: 19.69 ft at 3:00PM May 17, 2018Observed: 19.69 ft at 3:01PM May 17, 2018Observed: 19.69 ft at 3:15PM May 17, 2018Observed: 19.68 ft at 3:30PM May 17, 2018Observed: 19.67 ft at 3:45PM May 17, 2018Observed: 19.67 ft at 4:00PM May 17, 2018Observed: 19.66 ft at 4:15PM May 17, 2018Observed: 19.68 ft at 4:30PM May 17, 2018Observed: 19.66 ft at 4:45PM May 17, 2018Observed: 19.65 ft at 5:00PM May 17, 2018Observed: 19.65 ft at 5:15PM May 17, 2018Observed: 19.65 ft at 5:30PM May 17, 2018Observed: 19.64 ft at 5:45PM May 17, 2018Observed: 19.63 ft at 6:00PM May 17, 2018Observed: 19.63 ft at 6:15PM May 17, 2018Observed: 19.62 ft at 6:30PM May 17, 2018Observed: 19.61 ft at 6:45PM May 17, 2018Observed: 19.6 ft at 7:00PM May 17, 2018Observed: 19.59 ft at 7:15PM May 17, 2018Observed: 19.59 ft at 7:30PM May 17, 2018Observed: 19.59 ft at 7:45PM May 17, 2018Observed: 19.57 ft at 8:00PM May 17, 2018Observed: 19.57 ft at 8:15PM May 17, 2018Observed: 19.56 ft at 8:30PM May 17, 2018Observed: 19.56 ft at 8:45PM May 17, 2018Observed: 19.58 ft at 9:00PM May 17, 2018Observed: 19.56 ft at 9:15PM May 17, 2018Observed: 19.56 ft at 9:30PM May 17, 2018Observed: 19.55 ft at 9:45PM May 17, 2018Observed: 19.55 ft at 10:00PM May 17, 2018Observed: 19.55 ft at 10:15PM May 17, 2018Observed: 19.55 ft at 10:30PM May 17, 2018Observed: 19.55 ft at 10:31PM May 17, 2018Observed: 19.51 ft at 10:45PM May 17, 2018Observed: 19.51 ft at 10:46PM May 17, 2018Observed: 19.52 ft at 11:00PM May 17, 2018Observed: 19.52 ft at 11:01PM May 17, 2018Observed: 19.53 ft at 11:15PM May 17, 2018Observed: 19.52 ft at 11:30PM May 17, 2018Observed: 19.51 ft at 11:45PM May 17, 2018Observed: 19.5 ft at 12:00AM May 18, 2018Observed: 19.51 ft at 12:15AM May 18, 2018Observed: 19.49 ft at 12:30AM May 18, 2018Observed: 19.5 ft at 12:45AM May 18, 2018Observed: 19.49 ft at 1:00AM May 18, 2018Observed: 19.48 ft at 1:15AM May 18, 2018Observed: 19.47 ft at 1:30AM May 18, 2018Observed: 19.48 ft at 1:45AM May 18, 2018Observed: 19.48 ft at 2:00AM May 18, 2018Observed: 19.44 ft at 2:15AM May 18, 2018Observed: 19.45 ft at 2:30AM May 18, 2018Observed: 19.44 ft at 2:45AM May 18, 2018Observed: 19.45 ft at 3:00AM May 18, 2018Observed: 19.45 ft at 3:15AM May 18, 2018Observed: 19.46 ft at 3:30AM May 18, 2018Observed: 19.43 ft at 3:45AM May 18, 2018Observed: 19.42 ft at 4:00AM May 18, 2018Observed: 19.41 ft at 4:15AM May 18, 2018Observed: 19.42 ft at 4:30AM May 18, 2018Observed: 19.41 ft at 4:45AM May 18, 2018Observed: 19.39 ft at 5:00AM May 18, 2018Observed: 19.4 ft at 5:15AM May 18, 2018Observed: 19.38 ft at 5:30AM May 18, 2018Observed: 19.39 ft at 5:45AM May 18, 2018Observed: 19.36 ft at 6:00AM May 18, 2018Observed: 19.37 ft at 6:15AM May 18, 2018Observed: 19.37 ft at 6:30AM May 18, 2018Observed: 19.37 ft at 6:45AM May 18, 2018Observed: 19.38 ft at 7:00AM May 18, 2018Observed: 19.34 ft at 7:15AM May 18, 2018Observed: 19.33 ft at 7:30AM May 18, 2018Observed: 19.34 ft at 7:45AM May 18, 2018Observed: 19.34 ft at 8:00AM May 18, 2018Observed: 19.35 ft at 8:15AM May 18, 2018Observed: 19.32 ft at 8:30AM May 18, 2018Observed: 19.31 ft at 8:45AM May 18, 2018Observed: 19.32 ft at 9:00AM May 18, 2018Observed: 19.31 ft at 9:15AM May 18, 2018Observed: 19.32 ft at 9:30AM May 18, 2018Observed: 19.3 ft at 9:45AM May 18, 2018Observed: 19.31 ft at 10:00AM May 18, 2018Observed: 19.3 ft at 10:15AM May 18, 2018Observed: 19.29 ft at 10:30AM May 18, 2018Observed: 19.29 ft at 10:45AM May 18, 2018Observed: 19.29 ft at 11:00AM May 18, 2018Observed: 19.28 ft at 11:15AM May 18, 2018Observed: 19.28 ft at 11:30AM May 18, 2018Observed: 19.26 ft at 11:45AM May 18, 2018Observed: 19.26 ft at 12:00PM May 18, 2018Observed: 19.25 ft at 12:15PM May 18, 2018Observed: 19.24 ft at 12:30PM May 18, 2018Observed: 19.24 ft at 12:45PM May 18, 2018Observed: 19.24 ft at 1:00PM May 18, 2018Observed: 19.23 ft at 1:15PM May 18, 2018Observed: 19.22 ft at 1:30PM May 18, 2018Observed: 19.23 ft at 1:45PM May 18, 2018Observed: 19.23 ft at 2:00PM May 18, 2018Observed: 19.22 ft at 2:15PM May 18, 2018Observed: 19.23 ft at 2:30PM May 18, 2018Observed: 19.23 ft at 2:31PM May 18, 2018Observed: 19.22 ft at 2:45PM May 18, 2018Observed: 19.22 ft at 2:46PM May 18, 2018Observed: 19.23 ft at 3:00PM May 18, 2018Observed: 19.23 ft at 3:01PM May 18, 2018Observed: 19.22 ft at 3:15PM May 18, 2018Observed: 19.2 ft at 3:30PM May 18, 2018Observed: 19.19 ft at 3:45PM May 18, 2018Observed: 19.2 ft at 4:00PM May 18, 2018Observed: 19.21 ft at 4:15PM May 18, 2018Observed: 19.19 ft at 4:30PM May 18, 2018Observed: 19.18 ft at 4:45PM May 18, 2018Observed: 19.18 ft at 5:00PM May 18, 2018Observed: 19.18 ft at 5:15PM May 18, 2018Observed: 19.17 ft at 5:30PM May 18, 2018Observed: 19.16 ft at 5:45PM May 18, 2018Observed: 19.14 ft at 6:00PM May 18, 2018Observed: 19.16 ft at 6:15PM May 18, 2018Observed: 19.15 ft at 6:30PM May 18, 2018Observed: 19.16 ft at 6:45PM May 18, 2018Observed: 19.14 ft at 7:00PM May 18, 2018Observed: 19.15 ft at 7:15PM May 18, 2018Observed: 19.14 ft at 7:30PM May 18, 2018Observed: 19.12 ft at 7:45PM May 18, 2018Observed: 19.12 ft at 8:00PM May 18, 2018Observed: 19.12 ft at 8:15PM May 18, 2018Observed: 19.13 ft at 8:30PM May 18, 2018Observed: 19.1 ft at 8:45PM May 18, 2018Observed: 19.1 ft at 9:00PM May 18, 2018Observed: 19.1 ft at 9:15PM May 18, 2018Observed: 19.1 ft at 9:30PM May 18, 2018Observed: 19.09 ft at 9:45PM May 18, 2018Observed: 19.08 ft at 10:00PM May 18, 2018Observed: 19.08 ft at 10:15PM May 18, 2018Observed: 19.05 ft at 10:30PM May 18, 2018Observed: 19.05 ft at 10:31PM May 18, 2018Observed: 19.09 ft at 10:45PM May 18, 2018Observed: 19.09 ft at 10:46PM May 18, 2018Observed: 19.08 ft at 11:00PM May 18, 2018Observed: 19.08 ft at 11:01PM May 18, 2018Observed: 19.07 ft at 11:15PM May 18, 2018Observed: 19.05 ft at 11:30PM May 18, 2018Observed: 19.05 ft at 11:45PM May 18, 2018Observed: 19.04 ft at 12:00AM May 19, 2018Observed: 19.05 ft at 12:15AM May 19, 2018Observed: 19.05 ft at 12:30AM May 19, 2018Observed: 19.06 ft at 12:45AM May 19, 2018Observed: 19.02 ft at 1:00AM May 19, 2018Observed: 19.03 ft at 1:15AM May 19, 2018Observed: 19.03 ft at 1:30AM May 19, 2018Observed: 19.01 ft at 1:45AM May 19, 2018Observed: 19.01 ft at 2:00AM May 19, 2018Observed: 19.01 ft at 2:15AM May 19, 2018Observed: 18.99 ft at 2:30AM May 19, 2018Observed: 19.01 ft at 2:45AM May 19, 2018Observed: 18.99 ft at 3:00AM May 19, 2018Observed: 19 ft at 3:15AM May 19, 2018Observed: 18.99 ft at 3:30AM May 19, 2018Observed: 18.98 ft at 3:45AM May 19, 2018Observed: 18.97 ft at 4:00AM May 19, 2018Observed: 18.96 ft at 4:15AM May 19, 2018Observed: 18.96 ft at 4:30AM May 19, 2018Observed: 18.97 ft at 4:45AM May 19, 2018Observed: 18.95 ft at 5:00AM May 19, 2018Observed: 18.95 ft at 5:15AM May 19, 2018Observed: 18.95 ft at 5:30AM May 19, 2018Observed: 18.94 ft at 5:45AM May 19, 2018Observed: 18.96 ft at 6:00AM May 19, 2018Observed: 18.93 ft at 6:15AM May 19, 2018Observed: 18.93 ft at 6:30AM May 19, 2018Observed: 18.93 ft at 6:31AM May 19, 2018Observed: 18.95 ft at 6:45AM May 19, 2018Observed: 18.95 ft at 6:46AM May 19, 2018Observed: 18.93 ft at 7:00AM May 19, 2018Observed: 18.93 ft at 7:01AM May 19, 2018Observed: 18.92 ft at 7:15AM May 19, 2018Observed: 18.93 ft at 7:30AM May 19, 2018Observed: 18.92 ft at 7:45AM May 19, 2018Observed: 18.91 ft at 8:00AM May 19, 2018Observed: 18.91 ft at 8:15AM May 19, 2018Observed: 18.9 ft at 8:30AM May 19, 2018Observed: 18.89 ft at 8:45AM May 19, 2018Observed: 18.89 ft at 9:00AM May 19, 2018Observed: 18.91 ft at 9:15AM May 19, 2018Observed: 18.89 ft at 9:30AM May 19, 2018Observed: 18.88 ft at 9:45AM May 19, 2018Observed: 18.88 ft at 10:00AM May 19, 2018Observed: 18.88 ft at 10:15AM May 19, 2018Observed: 18.89 ft at 10:30AM May 19, 2018Observed: 18.86 ft at 10:45AM May 19, 2018Observed: 18.86 ft at 11:00AM May 19, 2018Observed: 18.86 ft at 11:15AM May 19, 2018Observed: 18.86 ft at 11:30AM May 19, 2018Observed: 18.85 ft at 11:45AM May 19, 2018Observed: 18.85 ft at 12:00PM May 19, 2018Observed: 18.84 ft at 12:15PM May 19, 2018Observed: 18.84 ft at 12:30PM May 19, 2018Observed: 18.84 ft at 12:45PM May 19, 2018Observed: 18.83 ft at 1:00PM May 19, 2018Observed: 18.83 ft at 1:15PM May 19, 2018Observed: 18.83 ft at 1:30PM May 19, 2018Observed: 18.81 ft at 1:45PM May 19, 2018Observed: 18.83 ft at 2:00PM May 19, 2018Observed: 18.81 ft at 2:15PM May 19, 2018Observed: 18.81 ft at 2:30PM May 19, 2018Observed: 18.81 ft at 2:31PM May 19, 2018Observed: 18.82 ft at 2:45PM May 19, 2018Observed: 18.82 ft at 2:46PM May 19, 2018Observed: 18.8 ft at 3:00PM May 19, 2018Observed: 18.8 ft at 3:01PM May 19, 2018Observed: 18.79 ft at 3:15PM May 19, 2018Observed: 18.79 ft at 3:30PM May 19, 2018Observed: 18.79 ft at 3:45PM May 19, 2018Observed: 18.78 ft at 4:00PM May 19, 2018Observed: 18.79 ft at 4:15PM May 19, 2018Observed: 18.78 ft at 4:30PM May 19, 2018Observed: 18.78 ft at 4:45PM May 19, 2018Observed: 18.78 ft at 5:00PM May 19, 2018Observed: 18.77 ft at 5:15PM May 19, 2018Observed: 18.76 ft at 5:30PM May 19, 2018Observed: 18.77 ft at 5:45PM May 19, 2018Observed: 18.76 ft at 6:00PM May 19, 2018Observed: 18.76 ft at 6:15PM May 19, 2018Observed: 18.76 ft at 6:30PM May 19, 2018Observed: 18.76 ft at 6:45PM May 19, 2018Observed: 18.75 ft at 7:00PM May 19, 2018Observed: 18.75 ft at 7:15PM May 19, 2018Observed: 18.75 ft at 7:30PM May 19, 2018Observed: 18.75 ft at 7:45PM May 19, 2018Observed: 18.74 ft at 8:00PM May 19, 2018Observed: 18.74 ft at 8:15PM May 19, 2018Observed: 18.73 ft at 8:30PM May 19, 2018Observed: 18.74 ft at 8:45PM May 19, 2018Observed: 18.72 ft at 9:00PM May 19, 2018Observed: 18.74 ft at 9:15PM May 19, 2018Observed: 18.72 ft at 9:30PM May 19, 2018Observed: 18.72 ft at 9:45PM May 19, 2018Observed: 18.72 ft at 10:00PM May 19, 2018Observed: 18.73 ft at 10:15PM May 19, 2018Observed: 18.72 ft at 10:30PM May 19, 2018Observed: 18.72 ft at 10:32PM May 19, 2018Observed: 18.72 ft at 10:45PM May 19, 2018Observed: 18.72 ft at 10:47PM May 19, 2018Observed: 18.72 ft at 11:00PM May 19, 2018Observed: 18.72 ft at 11:02PM May 19, 2018Observed: 18.72 ft at 11:15PM May 19, 2018Observed: 18.72 ft at 11:30PM May 19, 2018Observed: 18.71 ft at 11:45PM May 19, 2018Observed: 18.71 ft at 12:00AM May 20, 2018Observed: 18.72 ft at 12:15AM May 20, 2018Observed: 18.71 ft at 12:30AM May 20, 2018Observed: 18.7 ft at 12:45AM May 20, 2018Observed: 18.72 ft at 1:00AM May 20, 2018Observed: 18.69 ft at 1:15AM May 20, 2018Observed: 18.7 ft at 1:30AM May 20, 2018Observed: 18.69 ft at 1:45AM May 20, 2018Observed: 18.71 ft at 2:00AM May 20, 2018Observed: 18.68 ft at 2:15AM May 20, 2018Observed: 18.69 ft at 2:30AM May 20, 2018Observed: 18.69 ft at 2:45AM May 20, 2018Observed: 18.68 ft at 3:00AM May 20, 2018Observed: 18.67 ft at 3:15AM May 20, 2018Observed: 18.68 ft at 3:30AM May 20, 2018Observed: 18.67 ft at 3:45AM May 20, 2018Observed: 18.65 ft at 4:00AM May 20, 2018Observed: 18.67 ft at 4:15AM May 20, 2018Observed: 18.67 ft at 4:30AM May 20, 2018Observed: 18.66 ft at 4:45AM May 20, 2018Observed: 18.66 ft at 5:00AM May 20, 2018Observed: 18.65 ft at 5:15AM May 20, 2018Observed: 18.64 ft at 5:30AM May 20, 2018Observed: 18.64 ft at 5:45AM May 20, 2018Observed: 18.64 ft at 6:00AM May 20, 2018Observed: 18.64 ft at 6:15AM May 20, 2018Observed: 18.63 ft at 6:30AM May 20, 2018Observed: 18.63 ft at 6:32AM May 20, 2018Observed: 18.63 ft at 6:45AM May 20, 2018Observed: 18.63 ft at 6:47AM May 20, 2018Observed: 18.62 ft at 7:00AM May 20, 2018Observed: 18.62 ft at 7:02AM May 20, 2018Observed: 18.61 ft at 7:15AM May 20, 2018Observed: 18.62 ft at 7:30AM May 20, 2018Observed: 18.61 ft at 7:45AM May 20, 2018Observed: 18.61 ft at 8:00AM May 20, 2018Observed: 18.6 ft at 8:15AM May 20, 2018Observed: 18.6 ft at 8:30AM May 20, 2018Observed: 18.6 ft at 8:45AM May 20, 2018Observed: 18.59 ft at 9:00AM May 20, 2018Observed: 18.58 ft at 9:15AM May 20, 2018Observed: 18.57 ft at 9:30AM May 20, 2018Observed: 18.56 ft at 9:45AM May 20, 2018Observed: 18.56 ft at 10:00AM May 20, 2018Observed: 18.57 ft at 10:15AM May 20, 2018Observed: 18.56 ft at 10:30AM May 20, 2018Observed: 18.55 ft at 10:45AM May 20, 2018Observed: 18.55 ft at 11:00AM May 20, 2018Observed: 18.54 ft at 11:15AM May 20, 2018Observed: 18.55 ft at 11:30AM May 20, 2018Observed: 18.55 ft at 11:45AM May 20, 2018Observed: 18.55 ft at 12:00PM May 20, 2018Observed: 18.54 ft at 12:15PM May 20, 2018Observed: 18.53 ft at 12:30PM May 20, 2018Observed: 18.52 ft at 12:45PM May 20, 2018Observed: 18.52 ft at 1:00PM May 20, 2018Observed: 18.53 ft at 1:15PM May 20, 2018Observed: 18.52 ft at 1:30PM May 20, 2018Observed: 18.51 ft at 1:45PM May 20, 2018Observed: 18.51 ft at 2:00PM May 20, 2018Observed: 18.5 ft at 2:15PM May 20, 2018Observed: 18.5 ft at 2:30PM May 20, 2018Observed: 18.49 ft at 2:45PM May 20, 2018Observed: 18.49 ft at 2:46PM May 20, 2018Observed: 18.5 ft at 3:00PM May 20, 2018Observed: 18.5 ft at 3:01PM May 20, 2018Observed: 18.49 ft at 3:15PM May 20, 2018Observed: 18.49 ft at 3:16PM May 20, 2018Observed: 18.49 ft at 3:30PM May 20, 2018Observed: 18.48 ft at 3:45PM May 20, 2018Observed: 18.47 ft at 4:00PM May 20, 2018Observed: 18.47 ft at 4:15PM May 20, 2018Observed: 18.46 ft at 4:30PM May 20, 2018Observed: 18.48 ft at 4:45PM May 20, 2018Observed: 18.47 ft at 5:00PM May 20, 2018Observed: 18.47 ft at 5:15PM May 20, 2018Observed: 18.46 ft at 5:30PM May 20, 2018Observed: 18.46 ft at 5:45PM May 20, 2018Observed: 18.46 ft at 6:00PM May 20, 2018Observed: 18.44 ft at 6:15PM May 20, 2018Observed: 18.44 ft at 6:30PM May 20, 2018Observed: 18.43 ft at 6:45PM May 20, 2018Observed: 18.42 ft at 7:00PM May 20, 2018Observed: 18.44 ft at 7:15PM May 20, 2018Observed: 18.43 ft at 7:30PM May 20, 2018Observed: 18.45 ft at 7:45PM May 20, 2018Observed: 18.42 ft at 8:00PM May 20, 2018Observed: 18.44 ft at 8:15PM May 20, 2018Observed: 18.42 ft at 8:30PM May 20, 2018Observed: 18.42 ft at 8:45PM May 20, 2018Observed: 18.42 ft at 9:00PM May 20, 2018Observed: 18.41 ft at 9:15PM May 20, 2018Observed: 18.41 ft at 9:30PM May 20, 2018USGS--Water Resources of the United StatesHWDI4(plotting HGIRG) Graph Created (10:03PM May 20, 2018)ObservedLatest observed value: 18.41 ft at 9:30 PM CDT 20-May-2018. Flood Stage is 20.5 ft
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Tabular Data (UTC)
Tabular Data (CDT)
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Datum: NAVD88
Metadata
NOTE: Flood stage level has recently changed.

NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.

NOTE: Forecasts for the Big Sioux River above Hawarden are issued as needed during times of high water, but are not routinely available.

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Upstream Gauge - above Canton Upstream Gauge Downstream Gauge Downstream Gauge - at Akron
Flood Categories (in feet)
Major Flood Stage: 27
Moderate Flood Stage: 24
Flood Stage: 20.5
Action Stage: 18.5
Low Stage (in feet): -9999

Historic Crests
(1) 22.38 ft on 05/02/2016
(2) 20.35 ft on 05/23/2017
(3) 18.30 ft on 07/09/2015

(P): Preliminary values subject to further review.

Recent Crests
(1) 20.35 ft on 05/23/2017
(2) 22.38 ft on 05/02/2016
(3) 18.30 ft on 07/09/2015

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:16
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Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
27 Water backs up into the park in Hawarden, and some basements and sewers could begin to have problems.
25.5 Iowa Highway 10 begins to flood.
24 Some farm houses on the South Dakota side of the river are isolated by high water.
23 South Dakota Highway 46 begins to flood.
20.5 Agricultural flooding begins on the South Dakota side of the river.
About This Location Collapse

Latitude: 43.051389° N, Longitude: 96.489444° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 20.5 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 1150 Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

Additional Information Collapse
This location became the official NWS river forecast point for the Big Sioux River near Hawarden on January 1, 2017. On Wednesday, April 11, 2018, the elevation defining Flood Stage for HWDI4 will be changed from 19.0 feet to 20.5 feet. How low could the river get?
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
Sioux Falls Weather Forecast Office
26 Weather Lane
Sioux Falls, SD 57104-0198
(605) 330-4247
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Page last modified: 21-Dec-2016 10:37 PM
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