CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

CLEAR LAKE - LAKEPORT (CLKC1)

Latitude: 39.04º N	Longitude: 122.91º W	Elevation: 1318 Feet
Location: Lake County in California		Bulletin Group: Lower Sacramento		River Group: Cache Putah

Issuance Time:

Dec 26 2025 at 8:28 AM PST

Next Issuance:

Dec 26 2025 at 3:00 PM PST

Action/Monitor: 8.0 Feet

Minor Flood: 9.0 Feet

Moderate Flood: 11.9 Feet

Major Flood: 12.0 Feet

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.

Historical Mean Daily Stage/Storage Data
Water Year	Peak Storage (Ac-ft)	Stage (feet)	Date
Most Recent 5 Years
2025*	349,706	8.35	Feb 16, 2025
2024*	352,800	8.42	Feb 23, 2024
2023*	344,400	8.23	Mar 22, 2023
2022*	7,360	0.55	Feb 13, 2022
2021*	49,100	1.23	Mar 24, 2021
Historical High Stage/Flow Events (Period of Record - Oct 1984 to Present)**
1998	--	11.44	Feb 24, 1998
1986	480,900	11.34	Feb 2, 1986
1983	485,400	11.34	Jan 3, 1983
1914	471,800	11.09	Jan 28, 1914

* Data for the most recent 5 years utilizes mean daily values rather than instantaneous values
** Most recent continuous record back to Oct 1984 with segmented periods back to 1874

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
11.0 Feet	Major flooding occurs all around the north end of the lake, especially in Lakeport and Clearlake Oaks. Highway 20 around the north end of the lake is closed in some areas.
9.0 Feet	Low lying structures and some main roads around the lake are threatened by the high lake levels.
8.5 Feet	Minor flooding of some lake side residents occurs. More buildings are threatened from Lakeport to Clearlake Oaks.
8.5 Feet	Minor flooding of some lakeside residents occurs. More buildings are threatened from Lakeport to Clearlake Oaks.
8.0 Feet	Minor flooding of some lakeside residents occurs.

Official 7 Day National Weather Service Forecast (CAZ115)

Today: Rain showers through the day. Slight chance of thunderstorms in the afternoon. Breezy. Some thunderstorms may produce heavy rainfall in the afternoon. Highs 44 to 54. At higher elevation, south wind up to 25 mph in the morning. Gusts up to 40 mph.

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Chance of rain showers in the evening, then slight chance of rain showers overnight. Lows 32 to 42.

Saturday: Partly cloudy in the morning then clearing. Slight chance of rain showers in the morning. Highs 45 to 55.

Saturday Night: Partly cloudy. Lows 31 to 41.

Sunday: Mostly sunny. Highs 50 to 60.

Sunday Night through Monday Night: Mostly clear. Lows 33 to 43. Highs 50 to 64.

Tuesday: Sunny. Highs 56 to 66.

Tuesday Night and Wednesday: Mostly clear. Lows 35 to 45. Highs 56 to 66.

Wednesday Night: Partly cloudy. Lows 36 to 46.

New Years Day: Mostly cloudy. Chance of rain. Highs 50 to 60.

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 Eureka 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.