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Hydrograph River at a Glance Download
Sacramento-San Joaquin Delta at Mallard Island Stage (ft)Flow (kcfs)Highest Observation: 4.6 ft at 6:30AM Oct 22, 2020Observed: 3.1 ft at 5:45AM Oct 23, 2020Observed: 2 ft at 5:30AM Oct 24, 2020Observed: 3.2 ft at 7:30AM Oct 25, 2020Observed: 1.7 ft at 7:15AM Oct 26, 2020Forecast: 1.5 ft 7:15AM Oct 27, 2020Highest Forecast: 5.7 ft 1:45PM Oct 27, 2020Forecast: 2.3 ft 7:45PM Oct 27, 2020Forecast: 5.3 ft 12:30AM Oct 28, 2020Forecast: 1.7 ft 7:45AM Oct 28, 2020Highest Forecast: 5.7 ft 2:15PM Oct 28, 2020Forecast: 2.1 ft 8:30PM Oct 28, 2020MLIC1(plotting HGIRZ) Graph Created (2:22AM Oct 27, 2020)ObservedForecast (issued 7:40AM Oct 26)Latest observed value: 1.7 ft at 7:15 AM PDT 26-Oct-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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