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Hydrograph River at a Glance Download
Atherton Channel   upstream of Caltrain Stage (ft)Observed: 0.96 ft at 12:56PM Mar 21, 2023Observed: 1.08 ft at 2:07PM Mar 21, 2023Observed: 1.28 ft at 2:19PM Mar 21, 2023Observed: 1.4 ft at 2:40PM Mar 21, 2023Observed: 1.56 ft at 2:55PM Mar 21, 2023Observed: 1.74 ft at 3:10PM Mar 21, 2023Observed: 1.93 ft at 3:25PM Mar 21, 2023Observed: 2.03 ft at 3:31PM Mar 21, 2023Observed: 2.26 ft at 3:43PM Mar 21, 2023Observed: 2.47 ft at 3:50PM Mar 21, 2023Observed: 2.68 ft at 3:55PM Mar 21, 2023Observed: 2.9 ft at 4:00PM Mar 21, 2023Observed: 3.11 ft at 4:06PM Mar 21, 2023Observed: 3.34 ft at 4:14PM Mar 21, 2023Observed: 3.54 ft at 4:28PM Mar 21, 2023Observed: 3.77 ft at 4:40PM Mar 21, 2023Observed: 3.96 ft at 4:55PM Mar 21, 2023Observed: 4.2 ft at 5:05PM Mar 21, 2023Observed: 4.37 ft at 5:20PM Mar 21, 2023Observed: 4.58 ft at 5:35PM Mar 21, 2023Observed: 4.69 ft at 5:50PM Mar 21, 2023Observed: 4.9 ft at 6:00PM Mar 21, 2023Observed: 4.79 ft at 6:21PM Mar 21, 2023Observed: 4.68 ft at 7:04PM Mar 21, 2023Observed: 4.79 ft at 7:19PM Mar 21, 2023Observed: 4.92 ft at 7:34PM Mar 21, 2023Observed: 5.13 ft at 7:39PM Mar 21, 2023Observed: 4.89 ft at 7:53PM Mar 21, 2023Observed: 4.99 ft at 8:08PM Mar 21, 2023Highest Observation: 5.18 ft at 8:23PM Mar 21, 2023Observed: 4.98 ft at 8:30PM Mar 21, 2023Observed: 5.09 ft at 8:45PM Mar 21, 2023Observed: 4.89 ft at 8:56PM Mar 21, 2023Observed: 4.78 ft at 9:24PM Mar 21, 2023Observed: 4.67 ft at 9:49PM Mar 21, 2023Observed: 4.56 ft at 10:16PM Mar 21, 2023Observed: 4.43 ft at 10:31PM Mar 21, 2023Observed: 4.21 ft at 10:39PM Mar 21, 2023Observed: 4.11 ft at 10:54PM Mar 21, 2023Observed: 3.95 ft at 11:09PM Mar 21, 2023Observed: 3.75 ft at 11:24PM Mar 21, 2023Observed: 3.57 ft at 11:39PM Mar 21, 2023Observed: 3.43 ft at 11:54PM Mar 21, 2023Observed: 3.33 ft at 12:09AM Mar 22, 2023Observed: 3.16 ft at 12:24AM Mar 22, 2023Observed: 2.96 ft at 12:39AM Mar 22, 2023Observed: 2.82 ft at 12:54AM Mar 22, 2023Observed: 2.63 ft at 1:09AM Mar 22, 2023Observed: 2.5 ft at 1:24AM Mar 22, 2023Observed: 2.36 ft at 1:39AM Mar 22, 2023Observed: 2.24 ft at 1:54AM Mar 22, 2023Observed: 2.13 ft at 2:09AM Mar 22, 2023Observed: 2.02 ft at 2:24AM Mar 22, 2023Observed: 1.92 ft at 2:44AM Mar 22, 2023Observed: 1.89 ft at 3:32AM Mar 22, 2023Observed: 1.78 ft at 4:07AM Mar 22, 2023Observed: 1.68 ft at 4:44AM Mar 22, 2023Observed: 1.57 ft at 5:11AM Mar 22, 2023Observed: 1.46 ft at 5:37AM Mar 22, 2023Observed: 1.36 ft at 6:04AM Mar 22, 2023Observed: 1.26 ft at 6:42AM Mar 22, 2023Observed: 1.16 ft at 7:35AM Mar 22, 2023Observed: 1.26 ft at 8:38AM Mar 22, 2023Observed: 1.16 ft at 9:25AM Mar 22, 2023Observed: 1.06 ft at 10:05AM Mar 22, 2023Observed: 0.96 ft at 11:07AM Mar 22, 2023Observed: 0.85 ft at 12:06PM Mar 22, 2023Observed: 0.74 ft at 2:39PM Mar 22, 2023Observed: 0.86 ft at 3:12PM Mar 22, 2023Observed: 1.1 ft at 3:15PM Mar 22, 2023Observed: 1.39 ft at 3:18PM Mar 22, 2023Observed: 1.59 ft at 3:22PM Mar 22, 2023Observed: 1.64 ft at 3:32PM Mar 22, 2023Observed: 1.43 ft at 3:43PM Mar 22, 2023Observed: 1.33 ft at 4:14PM Mar 22, 2023Observed: 1.22 ft at 4:36PM Mar 22, 2023Observed: 1.42 ft at 4:51PM Mar 22, 2023Observed: 1.31 ft at 5:36PM Mar 22, 2023Observed: 1.2 ft at 5:54PM Mar 22, 2023Observed: 1.1 ft at 6:12PM Mar 22, 2023Observed: 0.99 ft at 6:34PM Mar 22, 2023Observed: 0.88 ft at 7:22PM Mar 22, 2023Observed: 0.78 ft at 8:01PM Mar 22, 2023Observed: 0.67 ft at 9:08PM Mar 22, 2023Observed: 0.57 ft at 10:21PM Mar 22, 2023Observed: 0.47 ft at 12:28AM Mar 23, 2023Observed: 0.38 ft at 3:32AM Mar 23, 2023Observed: 0.28 ft at 7:35AM Mar 23, 2023Observed: 0.18 ft at 1:16PM Mar 23, 2023Observed: 0.13 ft at 3:32PM Mar 23, 2023Observed: 0.24 ft at 11:00PM Mar 23, 2023Observed: 0.13 ft at 11:43PM Mar 23, 2023Observed: 0.06 ft at 3:32AM Mar 24, 2023Observed: 0.06 ft at 3:32PM Mar 24, 2023Observed: 0.06 ft at 3:32AM Mar 25, 2023Observed: 0.06 ft at 3:32PM Mar 25, 2023Observed: 0.06 ft at 3:32AM Mar 26, 2023ACUC1(plotting HGIRR) Graph Created (12:45PM Mar 26, 2023)ObservedLatest observed value: 0.06 ft at 3:32 AM PDT 26-Mar-2023.
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Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: Not Available
NOTE: Graphical forecasts are not available for the Atherton Channel upstream of Caltrain. During times of high water, forecast crest information can be found in the text products.
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Flood Categories (in feet)
Not Available

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.
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Gauge LocationGauge Map Marker
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.
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Latitude: 37.461900° N, Longitude: 122.193800° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft Not Available Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available 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  
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