CNRFC - Hydrology - Observed River/Reservoir Conditions

RUSSIAN RIVER - GUERNEVILLE (GUEC1)

Latitude: 38.50º N	Longitude: 123.00º W	Elevation: 65 Feet
Location: Sonoma County in California		River Group: Russian Napa

Monitor Stage: 29.0 Feet

Flood Stage: 32.0 Feet

Observed Data Credit
	Raw streamflow data is provided by the US Geological Survey (USGS). View USGS Data for this station location.

Historical Stage/Flow Data
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	57,729**	36.53	Feb 05, 2025
2024*	37,500**	28.91	Feb 6, 2024
2023*	44,600**	31.83	Jan 10, 2023
2022*	25,600**	23.49	Oct 25, 2021
2021*	2,950**	8.24	Feb 13, 2021
Historical High Stage/Flow Events (Period of Record - February 1940 to Present) - Ranked by Flow
1986*	102,000**	49.50	Feb 18, 1986
1995*	93,900**	48.00	Jan 10, 1995
1965*	93,400**	47.35	Dec 23, 1964
1956	90,100**	47.62	Dec 23, 1955
1940	88,400**	46.87	Feb 28, 1940
2019*	85,300**	45.38	Feb 27, 2019
* Discharge affected to unknown degree by regulation or diversion
** Estimated

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ506)

Tonight: Mostly clear in the evening then becoming partly cloudy. Areas of frost after midnight. Lows in the 30s to lower 40s. North winds 5 to 15 mph.

Friday: Partly cloudy in the morning then becoming sunny. Areas of frost in the morning. Highs in the 40s to upper 50s. East winds 5 to 10 mph.

Friday Night: Mostly clear in the evening then becoming partly cloudy. Areas of frost after midnight. Lows in the 30s to lower 40s. Northeast winds 5 to 10 mph.

Saturday: Mostly cloudy. Areas of frost in the morning. Highs in the 40s to upper 50s. East winds 5 to 10 mph.

Saturday Night: Mostly cloudy. Lows in the 30s to lower 40s. Northeast winds 5 to 10 mph.

Sunday: Mostly cloudy in the morning then becoming partly cloudy. Highs in the 50s to lower 60s.

Sunday Night: Mostly clear in the evening then becoming partly cloudy. Patchy fog. Lows in the 30s to mid 40s.

Monday: Sunny. Highs in the lower 50s to mid 60s.

Monday Night: Mostly clear except patchy fog. Lows in the 30s to upper 40s.

Tuesday: Sunny. Highs in the mid 50s to upper 60s.

Tuesday Night: Partly cloudy. Lows in the 40s to lower 50s.

Wednesday through Thursday: Mostly clear. Highs in the upper 50s to lower 70s. Lows in the 40s to lower 50s.

Flood Impacts
49.5 Feet	Flood of record. 2/18/1986 (102,000cfs).
48.5 Feet	Near record flooding. In Guerneville the Veterans building and the Sheriffs substation begin to flood.
47.0 Feet	In Guerneville businesses on the north side of Main Street flood. Travel most areas impossible.
46.0 Feet	Disastrous flooding. In Guerneville much of downtown floods. The Guerneville post office begins to flood. In Rio Nido, River Road floods.
45.0 Feet	Disastrous flooding is forecast to occur along the lower Russian River. Much of downtown Guerneville will become inundated. Many roads will flood making travel nearly impossible throughout the reach.
44.0 Feet	In Guerneville HWY 116 west of town closed. Safeway floods. In Monte Rio and Guerneville Park the main business sections flood. Travel in most areas nearly impossible.
41.5 Feet	In Guerneville, River Road closed. In Monte Rio the main intersections flood. Monte Rio Elementary School begins to flood.
40.0 Feet	Major flooding is expected along the Russian River. In Guerneville travel on River Road becomes very difficult. In Northwood upper Redwood Drive floods. In Cazadero Austin Creek Road floods.
39.0 Feet	West of Duncan Mills HWY 116 is closed. In Hacienda River Road floods. In Rio Nido Canyon 7 Road at the miniture golf course floods. In Guerneville the Triple R Resort begins to flood.
38.0 Feet	In Duncan Mills Freezeout Road at Moscow Road floods. In Guerneville Park Cazadero Road at HWY 116 floods.
37.0 Feet	In Forestville Mirabel Road at River Road floods. In Guerneville River Road east of Guerneville floods. Mill Street and 5th Street flood. In Monte Rio River Blvd east of Monte Rio floods.
36.0 Feet	In Forestville Mirabel Park Resort and Mirabel trailer park flood. In Guerneville Fern Road at HWY 116 floods.
35.0 Feet	Moderate flooding is forecast along the lower Russian River. Numerous businesses and residences in the lowest sections of towns within the reach are expected to flood. In Guerneville Brookside Resort begins to flood. More extensive flooding occurs at Parkers Resort. In Northwood lower Redwood Drive floods.
34.0 Feet	In Guerneville flooding begins at Johnsons Resort, Parkers Resort, Creekside Resort and Riverside Park. In Northwood lower Redwood Drive begins to flood.
33.0 Feet	In Guerneville the intersection of HWY 116 and Drake Rd is closed. In Monte Rio Willow and Alder Streets flood. In Forestville Mirabel trailer park begins to flood.
32.5 Feet	In Guerneville the intersecton of HWY 116 and Neeley Rd is closed. Mays Canyon Rd by the old rodeo grounds is closed.
32.0 Feet	Flood stage. Minor flooding. Lower Mill Street in Guerneville and Old Bohemian Highway in Monte Rio are expected to flood.
29.0 Feet	Monitor stage.

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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