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Hydrograph River at a Glance Download
Patapsco River at Ellicott City Stage (ft)Observed: 116.76 ft at 4:50AM Jan 24, 2020Observed: 116.73 ft at 5:50AM Jan 24, 2020Observed: 116.9 ft at 6:00AM Jan 24, 2020Observed: 116.85 ft at 6:20AM Jan 24, 2020Observed: 116.79 ft at 6:50AM Jan 24, 2020Observed: 116.78 ft at 7:50AM Jan 24, 2020Observed: 116.8 ft at 8:55AM Jan 24, 2020Observed: 116.82 ft at 9:50AM Jan 24, 2020Observed: 116.81 ft at 10:50AM Jan 24, 2020Observed: 116.8 ft at 11:50AM Jan 24, 2020Observed: 116.79 ft at 12:50PM Jan 24, 2020Observed: 116.75 ft at 1:50PM Jan 24, 2020Observed: 116.73 ft at 2:50PM Jan 24, 2020Observed: 116.69 ft at 3:50PM Jan 24, 2020Observed: 116.62 ft at 4:50PM Jan 24, 2020Observed: 116.69 ft at 5:50PM Jan 24, 2020Observed: 116.63 ft at 6:50PM Jan 24, 2020Observed: 116.61 ft at 7:50PM Jan 24, 2020Observed: 116.6 ft at 8:45PM Jan 24, 2020Observed: 116.51 ft at 8:50PM Jan 24, 2020Observed: 116.45 ft at 9:50PM Jan 24, 2020Observed: 116.61 ft at 10:00PM Jan 24, 2020Observed: 116.48 ft at 10:50PM Jan 24, 2020Observed: 116.65 ft at 11:00PM Jan 24, 2020Observed: 116.5 ft at 11:05PM Jan 24, 2020Observed: 116.66 ft at 11:25PM Jan 24, 2020Observed: 116.49 ft at 11:35PM Jan 24, 2020Observed: 116.51 ft at 11:50PM Jan 24, 2020Observed: 116.5 ft at 12:50AM Jan 25, 2020Observed: 116.43 ft at 1:50AM Jan 25, 2020Observed: 116.45 ft at 2:50AM Jan 25, 2020Observed: 116.69 ft at 4:05AM Jan 25, 2020Observed: 116.87 ft at 4:25AM Jan 25, 2020Observed: 116.97 ft at 4:35AM Jan 25, 2020Observed: 116.96 ft at 4:50AM Jan 25, 2020Observed: 117.14 ft at 5:05AM Jan 25, 2020Observed: 117.17 ft at 5:50AM Jan 25, 2020Observed: 117.36 ft at 6:05AM Jan 25, 2020Observed: 117.53 ft at 6:15AM Jan 25, 2020Observed: 117.77 ft at 6:25AM Jan 25, 2020Observed: 117.95 ft at 6:40AM Jan 25, 2020Observed: 118.16 ft at 7:00AM Jan 25, 2020Observed: 118.02 ft at 7:50AM Jan 25, 2020Observed: 118.18 ft at 7:55AM Jan 25, 2020Observed: 118.11 ft at 8:55AM Jan 25, 2020Observed: 118.05 ft at 9:50AM Jan 25, 2020Observed: 118.24 ft at 10:15AM Jan 25, 2020Observed: 118.09 ft at 10:50AM Jan 25, 2020Observed: 118.27 ft at 10:55AM Jan 25, 2020Observed: 118.22 ft at 11:50AM Jan 25, 2020Observed: 118.41 ft at 12:15PM Jan 25, 2020Observed: 118.43 ft at 12:50PM Jan 25, 2020Observed: 118.6 ft at 1:15PM Jan 25, 2020Observed: 118.45 ft at 1:25PM Jan 25, 2020Observed: 118.61 ft at 1:30PM Jan 25, 2020Observed: 118.46 ft at 1:50PM Jan 25, 2020Observed: 118.61 ft at 2:05PM Jan 25, 2020Observed: 118.51 ft at 2:50PM Jan 25, 2020Highest Observation: 118.67 ft at 3:35PM Jan 25, 2020Observed: 118.5 ft at 3:40PM Jan 25, 2020Observed: 118.37 ft at 3:50PM Jan 25, 2020Observed: 118.56 ft at 3:55PM Jan 25, 2020Observed: 118.37 ft at 4:25PM Jan 25, 2020Observed: 118.43 ft at 4:45PM Jan 25, 2020Observed: 118.28 ft at 4:50PM Jan 25, 2020Observed: 118.15 ft at 5:50PM Jan 25, 2020Observed: 118.03 ft at 6:50PM Jan 25, 2020Observed: 118.22 ft at 6:55PM Jan 25, 2020Observed: 118.01 ft at 7:50PM Jan 25, 2020Observed: 118.18 ft at 8:05PM Jan 25, 2020Observed: 117.96 ft at 8:45PM Jan 25, 2020Observed: 118 ft at 8:50PM Jan 25, 2020Observed: 118.01 ft at 9:45PM Jan 25, 2020Observed: 118 ft at 9:55PM Jan 25, 2020Observed: 117.8 ft at 10:50PM Jan 25, 2020Observed: 118.01 ft at 10:55PM Jan 25, 2020Observed: 117.8 ft at 11:50PM Jan 25, 2020Observed: 117.98 ft at 11:55PM Jan 25, 2020Observed: 117.79 ft at 12:35AM Jan 26, 2020Observed: 117.8 ft at 12:55AM Jan 26, 2020Observed: 117.7 ft at 1:50AM Jan 26, 2020Observed: 117.85 ft at 1:55AM Jan 26, 2020Observed: 117.67 ft at 2:50AM Jan 26, 2020Observed: 117.75 ft at 2:55AM Jan 26, 2020Observed: 117.6 ft at 3:50AM Jan 26, 2020Observed: 117.82 ft at 3:55AM Jan 26, 2020Observed: 117.65 ft at 4:10AM Jan 26, 2020Observed: 117.63 ft at 4:50AM Jan 26, 2020Observed: 117.64 ft at 5:50AM Jan 26, 2020Observed: 117.6 ft at 6:50AM Jan 26, 2020Observed: 117.53 ft at 7:50AM Jan 26, 2020Observed: 117.68 ft at 8:05AM Jan 26, 2020Observed: 117.62 ft at 8:50AM Jan 26, 2020Observed: 117.48 ft at 9:50AM Jan 26, 2020Observed: 117.65 ft at 10:10AM Jan 26, 2020Observed: 117.57 ft at 10:50AM Jan 26, 2020Observed: 117.63 ft at 11:05AM Jan 26, 2020Observed: 117.44 ft at 11:50AM Jan 26, 2020Observed: 117.59 ft at 12:00PM Jan 26, 2020Observed: 117.42 ft at 12:50PM Jan 26, 2020Observed: 117.59 ft at 1:20PM Jan 26, 2020Observed: 117.51 ft at 1:35PM Jan 26, 2020Observed: 117.54 ft at 1:50PM Jan 26, 2020Observed: 117.36 ft at 2:50PM Jan 26, 2020Observed: 117.53 ft at 3:25PM Jan 26, 2020Observed: 117.34 ft at 3:50PM Jan 26, 2020Observed: 117.5 ft at 3:55PM Jan 26, 2020Observed: 117.34 ft at 4:50PM Jan 26, 2020Observed: 117.36 ft at 5:50PM Jan 26, 2020Observed: 117.04 ft at 6:05PM Jan 26, 2020Observed: 117.43 ft at 6:10PM Jan 26, 2020Observed: 117.35 ft at 6:50PM Jan 26, 2020Observed: 117.3 ft at 7:50PM Jan 26, 2020Observed: 117.49 ft at 8:00PM Jan 26, 2020Observed: 117.33 ft at 8:25PM Jan 26, 2020Observed: 117.35 ft at 8:50PM Jan 26, 2020Observed: 117.24 ft at 9:50PM Jan 26, 2020Observed: 117.24 ft at 10:50PM Jan 26, 2020Observed: 117.17 ft at 11:50PM Jan 26, 2020Observed: 117.33 ft at 11:55PM Jan 26, 2020Observed: 117.35 ft at 12:45AM Jan 27, 2020Observed: 117.24 ft at 12:50AM Jan 27, 2020Observed: 117.14 ft at 1:50AM Jan 27, 2020Observed: 117.3 ft at 2:45AM Jan 27, 2020Observed: 117.12 ft at 2:50AM Jan 27, 2020Observed: 117.27 ft at 3:40AM Jan 27, 2020Observed: 117.14 ft at 3:45AM Jan 27, 2020Observed: 117.08 ft at 3:50AM Jan 27, 2020Observed: 117.11 ft at 4:50AM Jan 27, 2020Observed: 117.03 ft at 5:50AM Jan 27, 2020Observed: 116.72 ft at 6:15AM Jan 27, 2020Observed: 117.11 ft at 6:20AM Jan 27, 2020Observed: 117.06 ft at 6:50AM Jan 27, 2020Observed: 117.03 ft at 7:50AM Jan 27, 2020Observed: 117.18 ft at 8:10AM Jan 27, 2020Observed: 116.98 ft at 8:50AM Jan 27, 2020Observed: 117.15 ft at 9:05AM Jan 27, 2020Observed: 117.02 ft at 9:50AM Jan 27, 2020Observed: 117.17 ft at 10:00AM Jan 27, 2020Observed: 117.04 ft at 10:50AM Jan 27, 2020Observed: 116.97 ft at 11:50AM Jan 27, 2020Observed: 117.15 ft at 11:55AM Jan 27, 2020Observed: 116.98 ft at 12:25PM Jan 27, 2020Observed: 117.01 ft at 12:50PM Jan 27, 2020Observed: 116.92 ft at 1:50PM Jan 27, 2020Observed: 117.04 ft at 1:55PM Jan 27, 2020Observed: 116.93 ft at 2:50PM Jan 27, 2020Observed: 116.93 ft at 3:50PM Jan 27, 2020Observed: 117.08 ft at 4:10PM Jan 27, 2020Observed: 116.88 ft at 4:50PM Jan 27, 2020Observed: 117.05 ft at 5:20PM Jan 27, 2020Observed: 116.94 ft at 5:50PM Jan 27, 2020Observed: 116.85 ft at 6:50PM Jan 27, 2020Observed: 117.03 ft at 6:55PM Jan 27, 2020Observed: 116.73 ft at 7:25PM Jan 27, 2020Observed: 117.09 ft at 7:30PM Jan 27, 2020Observed: 116.93 ft at 7:50PM Jan 27, 2020Observed: 117.08 ft at 7:55PM Jan 27, 2020Observed: 116.96 ft at 8:50PM Jan 27, 2020Observed: 116.89 ft at 9:50PM Jan 27, 2020Observed: 117.04 ft at 10:00PM Jan 27, 2020Observed: 116.89 ft at 10:50PM Jan 27, 2020Observed: 117.09 ft at 10:55PM Jan 27, 2020Observed: 116.95 ft at 11:50PM Jan 27, 2020Observed: 116.88 ft at 12:50AM Jan 28, 2020Observed: 117.06 ft at 1:00AM Jan 28, 2020Observed: 116.94 ft at 1:50AM Jan 28, 2020Observed: 116.94 ft at 2:50AM Jan 28, 2020Observed: 117.02 ft at 3:05AM Jan 28, 2020Observed: 116.93 ft at 3:50AM Jan 28, 2020Observed: 116.83 ft at 4:50AM Jan 28, 2020Observed: 117.03 ft at 4:55AM Jan 28, 2020Observed: 116.93 ft at 5:50AM Jan 28, 2020Observed: 116.9 ft at 6:50AM Jan 28, 2020Observed: 117.06 ft at 7:25AM Jan 28, 2020Observed: 116.96 ft at 7:50AM Jan 28, 2020Observed: 116.89 ft at 8:50AM Jan 28, 2020Observed: 117.07 ft at 9:05AM Jan 28, 2020Observed: 116.91 ft at 9:50AM Jan 28, 2020Observed: 117.1 ft at 9:55AM Jan 28, 2020Observed: 116.95 ft at 10:45AM Jan 28, 2020Observed: 116.9 ft at 10:50AM Jan 28, 2020Observed: 117.09 ft at 11:00AM Jan 28, 2020Observed: 116.93 ft at 11:35AM Jan 28, 2020Observed: 116.87 ft at 11:50AM Jan 28, 2020Observed: 117.02 ft at 11:55AM Jan 28, 2020Observed: 116.89 ft at 12:40PM Jan 28, 2020Observed: 116.89 ft at 12:50PM Jan 28, 2020Observed: 116.8 ft at 1:50PM Jan 28, 2020Observed: 116.97 ft at 1:55PM Jan 28, 2020Observed: 116.59 ft at 2:40PM Jan 28, 2020Observed: 116.89 ft at 2:45PM Jan 28, 2020Observed: 116.78 ft at 2:50PM Jan 28, 2020Observed: 116.98 ft at 3:00PM Jan 28, 2020Observed: 116.8 ft at 3:50PM Jan 28, 2020Observed: 116.96 ft at 4:10PM Jan 28, 2020Observed: 116.79 ft at 4:50PM Jan 28, 2020Observed: 116.96 ft at 4:55PM Jan 28, 2020Observed: 116.87 ft at 5:50PM Jan 28, 2020Observed: 117.04 ft at 6:00PM Jan 28, 2020Observed: 116.98 ft at 6:50PM Jan 28, 2020Observed: 116.89 ft at 7:50PM Jan 28, 2020Observed: 116.89 ft at 8:50PM Jan 28, 2020Observed: 117.07 ft at 9:20PM Jan 28, 2020Observed: 116.91 ft at 9:45PM Jan 28, 2020Observed: 116.87 ft at 9:50PM Jan 28, 2020Observed: 117.03 ft at 10:05PM Jan 28, 2020Observed: 116.91 ft at 10:50PM Jan 28, 2020Observed: 116.83 ft at 11:50PM Jan 28, 2020Observed: 117 ft at 11:55PM Jan 28, 2020Observed: 116.86 ft at 12:50AM Jan 29, 2020Observed: 117.02 ft at 1:15AM Jan 29, 2020Observed: 116.81 ft at 1:30AM Jan 29, 2020Observed: 116.99 ft at 1:35AM Jan 29, 2020Observed: 116.82 ft at 1:50AM Jan 29, 2020Observed: 117.03 ft at 1:55AM Jan 29, 2020Observed: 116.89 ft at 2:50AM Jan 29, 2020Observed: 116.88 ft at 3:50AM Jan 29, 2020ELPM2(plotting HGIRR) Graph Created (4:24AM Jan 29, 2020)ObservedLatest observed value: 116.88 ft at 3:50 AM EST 29-Jan-2020. Flood Stage is 122.5 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Gauge reading may be affected by ice.

NOTE: Forecasts are not available for the Patapsco River at Ellicott City. Only observed stages are available for this point.

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Upstream Gauge - at Hollofield Upstream Gauge Downstream Gauge Downstream Gauge - near Catonsville
Flood Categories (in feet)
Major Flood Stage: 127
Moderate Flood Stage: 125
Flood Stage: 122.5
Action Stage: 121.5
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

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

Zoom Level:15
KML Image
Gauge LocationGauge Map Marker
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
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127 Major flooding is occurring in lower Old Town Ellicott City. The flooding will be even more significant if local rainfall has occurred, causing additional backwater flooding.
125 Main Street in Ellicott City is flooded near the railroad bridge with water either approaching or entering buildings. Backwater flooding may be occurring further upstream if local rainfall has occurred.
124 Main Street in Ellicott City begins to flood both near 8000 Main Street and near the intersection of Main Street and Maryland Avenue.
122 Water exceeds the banks and approaches an access road adjacent to 8000 Main Street in Ellicott City.
About This Location Collapse

Latitude: 39.268333° N, Longitude: 76.793889° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 122.5 ft  
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available  
NGVD 29 Not Available Not Available  
MSL Not Available Not Available  
Other Not Available Not Available  
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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
(Baltimore/Washington) Sterling Weather Forecast Office
43858 Weather Service Rd.
Sterling, VA 20166
(703) 996-2200
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Page last modified: 1-Mar-2019 12:35 AM
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