CNRFC - Ensemble Products

*** IMPORTANT *** Week of June 16 - Website Data Outage - Due to a major computer upgrade the week of June 16, nearly all data on the CNRFC web site will not be updated. We anticipate the down time to be approximately 4 days. The latest deterministic hydrologic forecasts for official forecast points will continue to be available at the National Water Prediction Service during this time.

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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

Issuance Time:

Jun 16, 2025 at 6:48 AM PDT

Action/Monitor: 5.5 Feet

Minor Flood: 6.0 Feet

Moderate Flood: 6.8 Feet

Major Flood: 7.3 Feet

Please Note:

Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.

Threshold Exceedance Plot Product Information

CSV Ensemble Files (Data in kcfs): Forecast Group | WWBC1

Select Threshold to Use: Threshold Value: Threshold Label:

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		Official Forecast (Deterministic)

		Prob. of Threshold Exceedance
		Model Traces

What information is considered in this forecast?

Verification / Historical Plots
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Upstream Photo	Gage House Photo	Downstream Photo

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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)

Today: Sunny. Highs 73 to 83. Southwest winds 10 to 15 mph increasing to 15 to 25 mph with gusts up to 40 mph in the afternoon.

Tonight: Clear. Lows 35 to 45. West winds 15 to 20 mph with gusts up to 35 mph decreasing to around 10 mph after midnight.

Tuesday: Sunny. Highs 77 to 87. Light winds becoming northeast around 10 mph in the afternoon.

Tuesday Night: Clear. Lows 43 to 53. North winds around 10 mph in the evening becoming light.

Wednesday: Sunny. Highs 83 to 93. Light winds becoming south around 10 mph in the afternoon.

Wednesday Night: Clear. Lows 45 to 55.

juneteenth through Friday Night: Breezy, clear. Highs 78 to 88. Lows 39 to 49.

Saturday through Sunday: Breezy, clear. Highs 67 to 77. Lows 26 to 36.

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