CNRFC - Hydrology - Observed River/Reservoir Conditions

WEST WALKER RIVER - BELOW LITTLE WALKER RIVER NEAR COLEVILLE (WWBC1)

Latitude: 38.38º N	Longitude: 119.45º W	Elevation: 6591 Feet
Location: Mono County in California		Bulletin Group: Eastern Sierra		River Group: Eastern Sierra

Action/Monitor: 5.5 Feet

Minor Flood: 6.0 Feet

Moderate Flood: 6.8 Feet

Major Flood: 7.3 Feet

Plot Type:

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 Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024	1,840	4.96	May 19, 2024
2023	3,820	6.67	Jun 19, 2023
2022	3,030	6.05	Oct 25, 2021
2021	909	3.65	May 7, 2021
2020	1,300	4.19	Apr 29, 2020
Historical High Stage/Flow Events (Period of Record - Apr 1938 to Present) - Ranked by Flow
1997*	12,300	10.11	Jan 02, 1997
1951*	6,220	8.10	Nov 20, 1950
1938*	5,800	--	Dec 11, 1937
1956*	5,180	7.41	Dec 23, 1955
1996*	4,610	6.55	May 16, 1996
* Numerous small gage location changes, some including datum changes, prior to Mar 1997.

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
10.5 Feet	Incredible flood disaster with massive and uncertain impacts in excess of the January 1997 event.
10.0 Feet	Flood of record. Highway 395 in West Walker River Canyon closed for months. Massive destruction to infrastructure and economy including transportation, power, water, homes, businesses, etc. Area isolated. Near this flow in January 1997 a 6.5-mile stretch of Highway 395 completely scoured with debris from the canyon deposited in the town of Walker.
9.5 Feet	Near record flooding. Area cut off as most transportation routes into area destroyed or flooded. Massive destruction of infrastructure and economy including utilities, roads, business, homes, etc.
8.5 Feet	Flood disaster from Walker River Canyon through Antelope Valley. Widespread flood damage to roads, bridges, homes and structures along river. Severe damage to Highway 395 in W Walker River Canyon with the highway likely closed. Historically this flow has been exceeded only once in January 1997.
8.0 Feet	Flooding near disaster levels in the West Walker Canyon and in Antelope Valley. Numerous structures flooded and roads washed out. Sections of Highway 395 likely destroyed in West Walker Canyon. Major damage to agricutural land due to erosion and destroyed diversion dams, headgates, canals and levees. Similar to the 2nd highest flood of record in November of 1950, and only exceeded in January 1997.
7.3 Feet	Major flooding in the West Walker River Canyon and in Antelope Valley including Walker, Coleville and Topaz California. Many buildings flooded and roads washed out. Major damage to agricultural lands. Extensive sandbagging required to protect propery. Transportiation affected. Damage to Highway 395 in the West Walker Canyon likely. Similar to the 4th highest peak flow in the 85 year gage record.
6.8 Feet	Moderate flooding of lowlands, agricultural land, yards, basements and rural roads in the West Walker River Canyon and in Antelope Valley including Walker, Coleville and Topaz California. Flooding of structures limited although some sandbagging necessary Roughly similar, but slightly below the June 2017 peak.
6.5 Feet	Expanding minor flooding of lowlands, pastures and some rural roads between the West Walker River Canyon and Topaz Lake, including Walker Coleville and Topaz California. Out of bank flows may cause significant erosion of agricuturural lands. Similar to the peak of June 2023.
6.0 Feet	Flood stage. Minor flooding of lowlands pasture & rural roads in Antelope Valley including Walker, Coleville and Topaz California. Roughly similar to June 2019 and October 2021 crests.
5.5 Feet	Monitor Stage, No flooding in reach from West Walker River Canyon through Antelope Valley CA including Walker, Coleville, Topaz CA.

Official 7 Day National Weather Service Forecast (CAZ073)

Tonight: Clear. Lows 23 to 33. Southwest winds 15 to 25 mph with gusts up to 50 mph becoming west around 10 mph after midnight. Ridge gusts up to 65 mph in the evening.

Tuesday: Sunny in the morning, then mostly cloudy with a chance of showers and thunderstorms in the afternoon. Snow level rising to 6500 feet. Snow accumulation of 1 to 4 inches. Highs 44 to 54. Northwest winds 10 to 15 mph.

Tuesday Night: Mostly cloudy in the evening then clearing. Lows 21 to 31. Northwest winds 10 to 15 mph.

Wednesday: Sunny. Highs 54 to 64. Light winds becoming north around 10 mph in the afternoon.

Wednesday Night: Mostly cloudy in the evening then clearing. Lows 27 to 37. Northwest winds 10 to 15 mph in the evening becoming light.

Thursday: Sunny. Highs 61 to 71.

Thursday Night: Mostly cloudy. Lows 32 to 42.

Friday and Friday Night: Mostly cloudy. Highs 60 to 70. Lows 35 to 45.

Saturday: Mostly cloudy in the morning, then partly cloudy with a slight chance of showers in the afternoon. Highs 55 to 65.

Saturday Night and Sunday: Partly cloudy with a slight chance of showers. Lows 28 to 38. Highs 52 to 62.

Sunday Night: Breezy. Partly cloudy. Lows 30 to 40.

Monday: Partly cloudy in the morning then becoming sunny. Highs 59 to 69.

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 Reno 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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