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Hydrograph River at a Glance Download
Sacramento-San Joaquin Delta at Mallard Island Stage (ft)Flow (kcfs)Observed: 1.9 ft at 7:45AM Sep 14, 2020Observed: 4.4 ft at 4:30PM Sep 14, 2020Observed: 3.6 ft at 5:30AM Sep 16, 2020Observed: 4.5 ft at 5:15AM Sep 17, 2020Highest Observation: 4.8 ft at 5:45AM Sep 18, 2020Forecast: 2 ft 10:45PM Sep 18, 2020Forecast: 5.8 ft 4:45AM Sep 19, 2020Forecast: 1.8 ft 11:15AM Sep 19, 2020Forecast: 6 ft 4:30PM Sep 19, 2020Forecast: 1.9 ft 11:30PM Sep 19, 2020Forecast: 5.7 ft 5:30AM Sep 20, 2020Forecast: 2.2 ft 11:45AM Sep 20, 2020Highest Forecast: 6.2 ft 5:15PM Sep 20, 2020MLIC1(plotting HGIRZ) Graph Created (5:22PM Sep 18, 2020)ObservedForecast (issued 6:09AM Sep 18)Latest observed value: 4.8 ft at 5:45 AM PDT 18-Sep-2020.
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Tabular Data (UTC)
Tabular Data (PDT)
XML Data
RSS Files
Datum: Not Available
NOTE: Forecasts for the Sacramento-San Joaquin Delta at Mallard Island are issued routinely year-round.
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Flood Categories (in feet)
Not Available

Historic Crests

(P): Preliminary values subject to further review.

Recent Crests

(P): Preliminary values subject to further review.

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: 38.042778° N, Longitude: 121.920000° 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  

Current/Historical Observations:

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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.
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Page last modified: 1-Mar-2019 12:32 AM
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