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Hydrograph River at a Glance Download
Sacramento-San Joaquin Delta at Mallard Island Stage (ft)Flow (kcfs)Highest Observation: 5 ft at 5:45AM Jan 17, 2021Highest Observation: 5 ft at 7:00AM Jan 17, 2021Observed: 4.4 ft at 6:00AM Jan 19, 2021Observed: 4.8 ft at 6:00AM Jan 20, 2021Observed: 3.4 ft at 5:30PM Jan 20, 2021Forecast: 2.1 ft 4:15PM Jan 21, 2021Forecast: 4.1 ft 9:15PM Jan 21, 2021Forecast: 2.9 ft 2:30AM Jan 22, 2021Forecast: 6 ft 9:15AM Jan 22, 2021Forecast: 1.9 ft 5:15PM Jan 22, 2021Forecast: 3.9 ft 10:30PM Jan 22, 2021Forecast: 3.3 ft 3:15AM Jan 23, 2021Highest Forecast: 6.1 ft 10:00AM Jan 23, 2021Forecast: 1.5 ft 6:15PM Jan 23, 2021MLIC1(plotting HGIRZ) Graph Created (12:52PM Jan 21, 2021)ObservedForecast (issued 6:20AM Jan 21)Latest observed value: 3.4 ft at 5:30 PM PST 20-Jan-2021.
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Tabular Data (UTC)
Tabular Data (PST)
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Datum: Not Available
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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
 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.
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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)		 Elevation
(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.
NWS Information
National Weather Service
Sacramento Weather Forecast Office

Sacramento, CA
(916) 979-3051
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