CNRFC - Hydrology - River Guidance - Graphical RVF

End of River Group

Location:

SACRAMENTO RIVER DELTA - MALLARD ISLAND (MLIC1)

Latitude: 38.04º N	Longitude: 121.92º W	Elevation: 0 Feet
Location: Contra Costa County in California		Bulletin Group: Lower Sacramento		River Group: Lower Sacramento

Issuance Time:

Dec 26 2025 at 2:03 PM PST

Next Issuance:

Dec 27 2025 at 9:00 AM PST

Action/Monitor: N/A

Minor Flood: N/A

Moderate Flood: N/A

Major Flood: N/A

Plot Type:

Please Note:
1) Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View California Department of Water Resources Data for this station location.

Delta Tide Forecast - Text Bulletin (RNORVFSAC)
Rio Vista, Antioch, Mallard Island, and Venice Island

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ018)

Tonight: Mostly cloudy with a chance of rain in the evening, then partly cloudy with a slight chance of rain after midnight. Partly cloudy late in the night. Lows around 44. South winds 10 to 15 mph with gusts to around 25 mph.

Saturday: Partly cloudy in the morning then becoming mostly cloudy. Highs around 51. West winds up to 10 mph shifting to the north around 10 mph in the afternoon.

Saturday Night: Mostly clear. Lows around 39. Northwest winds up to 10 mph with gusts to around 20 mph.

Sunday: Mostly cloudy in the morning then clearing. Highs around 49. North winds up to 10 mph with gusts to around 20 mph.

Sunday Night: Mostly clear in the evening then becoming mostly cloudy. Lows around 37. North winds up to 10 mph.

Monday: Mostly cloudy. Highs around 49.

Monday Night: Partly cloudy. Lows around 37.

Tuesday: Mostly cloudy. Highs around 50.

Tuesday Night: Mostly clear. Lows around 37.

Wednesday: Mostly cloudy. Highs around 49.

Wednesday Night: Mostly cloudy with a slight chance of rain. Lows around 40.

New Years Day through Friday: Mostly cloudy with a chance of rain. Highs around 51. Lows around 42.

Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS Sacramento Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.

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