National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

Latitude: 38.38º NLongitude: 119.45º WElevation: 6591 Feet
Location: Mono County in CaliforniaRiver Group: Eastern Sierra
Issuance Time: Dec 15 2017 at 7:44 AM PSTNext Issuance: Dec 15 2017 at 3:00 PM PST
Monitor Stage: 5.5 FeetFlood Stage: 6.0 Feet
Observed Data Credit
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Raw streamflow data is provided by the US Geological Survey (USGS).
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Historical Stage/Flow Data
Water Year
Peak Discharge (cfs)
Stage (feet)
 Most Recent 5 Years
Jun 8, 2016
Jun 11, 2015
May 26, 2014
May 13, 2013
Apr 23, 2012
 Historical High Stage/Flow Events (Period of Record - Apr 1938 to Present)
Jan 02, 1997
Nov 20, 1950
Dec 11, 1937
Location Photographs
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ073)
Today: Sunny in the morning then becoming partly cloudy. Highs 51 to 61. Southwest winds up to 10 mph.

Tonight: Mostly cloudy. Slight chance of snow showers after midnight. Lows 23 to 33. West winds around 10 mph.

Saturday: Partly cloudy with a chance of snow showers in the morning, then sunny in the afternoon. Highs 36 to 46. North winds 10 to 15 mph with gusts up to 30 mph. Ridge gusts up to 60 mph increasing to 75 mph in the afternoon.

Saturday Night: Clear. Lows 11 to 21. North winds 10 to 15 mph. Gusts up to 35 mph in the evening. Ridge gusts up to 85 mph.

Sunday: Sunny. Highs 38 to 48. North winds around 10 mph. Ridge gusts up to 70 mph.

Sunday Night: Clear. Lows 8 to 18.

Monday through Tuesday Night: Partly cloudy. Highs 46 to 56. Lows 8 to 18.

Wednesday and Wednesday Night: Partly cloudy with a slight chance of snow showers. Highs 43 to 53. Lows 8 to 18.

Thursday: Sunny. Highs 33 to 43.
Impacts - E19 Information
5.5 FeetMonitoring stage. No flooding. Max diversion to Topaz ~1300 cfs, rest goes downstream to Smith Valley. If Topaz is releasing...flow at Wellington will be Topaz release plus amount going down West Walker below diversion. Reach: W Walker River Canyon; lower Antelope Valley from W Walker River mouth to Topaz Lake including Walker/Coleville/Topaz; Smith Valley including Smith and Wellington; Mason Valley including Yerington. Approximately 2400 cfs.
6.0 FeetFlood Stage. Some minor flooding of lowlands...pastures and rural roads. Maximum diversion to Topaz Lake is about 1300 cfs...remainder goes down the West Walker to Smith Valley/Wellington. If Topaz is releasing...flow at Wellington will be Topaz release plus amount going the West Walker below the Topaz diversion. Approximately 3000 cfs.
6.6 FeetMinor to moderate flooding of lowlands...pastures and some rural roads along river from Walker to Topaz Lake. Moderate flooding on the lower West Walker (Smith Valley/Wellington) and mainstem Walker (Mason Valley/Yerington). Some sandbagging of structures likely in the Mason Valley/Yerington area. Approximately 3800 cfs with a 1 in 10 chance of occurring any given year.
7.0 FeetSignificant flooding of lowlands, agricultural land, yards, basements, rural roads. Flooding of structures limited in Antelope and Smith Valleys, although sandbagging necessary. Structure flooding significant in Mason Valley/Yerington on mainstem with much sandbagging. Approximately 4500 cfs with a 1 in 15 chance of occurring any given year. In July 1995, several homes and businesses flooded in the Smith/Mason Valleys, thousands of acres of farmland flooded, and levees overtopped.
7.3 FeetMajor flooding through reach and in Mason Valley and Yerington. Many buildings, roads flooded/washed out, major damage to agricultural lands, much sandbagging. Transportation affected. Severe damage to Highway 395 in W Walker Canyon. Approximately 5000 cfs with a 1 in 20 chance of occurring any given year.
7.9 FeetFlooding near disaster levels through reach and Mason Valley/Yerington. Numerous structures flooded, roads washed out, many sections of Highway 395 destroyed in W Walker Canyon. Major damage to agricultural land due to erosion and destroyed facilities (diversion dams, headgates, canals, levees). Approximately 6100 cfs with a 1 in 35 chance of occurring any given year.
8.25 FeetFlood disaster along entire reach...from W Walker River Canyon to Smith/Mason valleys. Widespread flood damage to and structures along river. Severe damage to Highway 395 in Walker Canyon...and NV state route 208 in Smith Valley/Wilson Canyon. These highways likely closed. Approximately 6800 cfs with a 1 in 50 chance of occurring any given year. Historically this flow has been reached or exceeded only twice...December 1937 and January 1997.
8.8 FeetFlood disaster from Walker River Canyon to Antelope Valley/Topaz Lake...Smith Valley/Wellington and Mason Valley/Yerington. Widespread flood damage to and structures along river. Severe damage to Highway 395 in W Walker River Canyon and NV Highway 208 in Smith Valley/Wilson Canyon. These highways probably closed. Approximately 8200 cfs with a 1 in 100 chance of occurring any given year. Historically this flow has been exceeded only once...January 1997.
9.5 FeetNear record flooding. Area cut off as most transportation routes into area destroyed/flooded. Massive destruction of infrastructure/economy including power, roads, business, water, homes, etc. Approximately 10,000 cfs with a 1 in 200 chance of occuring in any given year.
10.25 FeetFlood of record. Highway 395 in W Walker River Canyon closed for months. Massive destruction to infrastructure and economy including transportation, power, water, homes, businesses, etc. Area isolated. At this stage, 6.5 mile stretch of Highway 395 completely scoured with debris from canyon deposited in the town of Walker. Approximately 12,500 cfs with a 1 in 500 chance of occurring in any given year.
10.5 FeetIncredible flood disaster previously unknown. Greater than 13,000 cfs.
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.