CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

ARROYO VALLE - LANG CANYON (YLEC1)

Latitude: 37.56º N	Longitude: 121.68º W	Elevation: 750 Feet
Location: Alameda County in California		Bulletin Group: Central Coast		River Group: South Bay

Issuance Time:

Dec 25 2025 at 2:02 PM PST

Next Issuance:

Dec 26 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 US Geological Survey (USGS). View US Geological Survey (USGS) Data for this station location.

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ515)

rest of Tonight: Showers likely and a slight chance of thunderstorms late in the evening, then a chance of showers after midnight. Some thunderstorms may be severe with heavy rainfall. Lows in the mid 40s. Southwest winds around 20 mph with gusts to around 45 mph.

Friday: A chance of showers in the morning, then showers likely and a slight chance of thunderstorms in the afternoon. Some thunderstorms may produce heavy rainfall in the afternoon. Highs in the lower 50s. South winds 10 to 20 mph with gusts to around 35 mph.

Friday Night: Mostly cloudy. A slight chance of thunderstorms in the evening. A chance of showers. Some thunderstorms may produce heavy rainfall in the evening. Lows in the lower 40s. Southwest winds around 10 mph.

Saturday: Mostly cloudy. Highs in the upper 40s. Northwest winds 5 to 10 mph.

Saturday Night: Mostly clear. Lows in the upper 30s. Northwest winds around 5 mph.

Sunday: Partly cloudy in the morning then becoming sunny. Highs in the upper 40s.

Sunday Night through Monday Night: Mostly clear. Lows in the upper 30s. Highs around 50.

Tuesday: Mostly cloudy in the morning then becoming sunny. Highs in the lower 50s.

Tuesday Night: Mostly clear. Lows in the upper 30s.

Wednesday: Partly cloudy. Highs in the lower 50s.

Wednesday Night: Partly cloudy. A slight chance of showers. Lows around 40.

New Years Day: Mostly cloudy. A chance of showers. Highs in the lower 50s.

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 San Francisco Bay Area-Monterey 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.