CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SAN JOAQUIN RIVER DELTA - ROUGH & READY ISLAND (RRIC1)

Latitude: 37.96º N	Longitude: 121.36º W	Elevation: 15 Feet
Location: Contra Costa County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Issuance Time:

Dec 27 2025 at 9:54 AM PST

Next Issuance:

Dec 28 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.

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ018)

Today: Mostly cloudy in the morning then clearing. Patchy fog in the morning. Highs 49 to 55. Northwest winds up to 10 mph shifting to the north in the afternoon.

Tonight: Mostly clear in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows around 38. Northeast winds up to 10 mph.

Monday: Patchy dense fog in the morning. Mostly cloudy. Highs 47 to 52. Northeast winds up to 10 mph.

Monday Night: Mostly clear in the evening then becoming mostly cloudy. Lows around 37. Light winds.

Tuesday: Mostly cloudy. Highs around 50. Northeast winds up to 10 mph.

Tuesday Night: Mostly cloudy. Lows around 39.

Wednesday: Mostly cloudy. Highs around 50.

Wednesday Night: Mostly cloudy with a chance of rain. Lows around 42.

New Years Day: Cloudy with a chance of rain. Highs around 51.

Thursday Night: Rain likely. Lows around 46.

Friday: Mostly cloudy with rain likely. Highs around 53.

Friday Night and Saturday: Mostly cloudy with a chance of rain. Lows around 45. Highs around 51.

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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Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.