National Weather Service Advanced Hydrologic Prediction Service

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Weather Forecast Office Reno, NV

California Nevada River Forecast Center

Hydrograph

River at a Glance

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About this graph

Tabular Data (UTC)

Tabular Data (PDT)

Datum: NGVD29

Metadata

NOTE: Stage may be affected by ice during winter months.

NOTE: Reported historic crests have been estimated using recent ratings due to previous channel, location and/or datum changes. USGS observed crests can be found at: waterdata.usgs.gov/nwis/rt Please also see Additional Information tab at the bottom of this page.

Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the Walker River near Mason - Snyder Lane are issued routinely year-round.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet)

Major Flood Stage:	11.6
Moderate Flood Stage:	11
Flood Stage:	9.8
Action Stage:	9
Low Stage (in feet):	-9999

Historic Crests
(1) 11.64 ft on 06/08/2023
(2) 10.62 ft on 07/11/1995 (P)
(3) 10.52 ft on 06/22/2017 (P)
(4) 10.34 ft on 06/19/1983 (P)
(5) 9.78 ft on 07/01/2011 (P)
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 11.64 ft on 06/08/2023
(2) 10.52 ft on 06/22/2017 (P)
(3) 9.77 ft on 06/06/2017 (P)
(4) 9.78 ft on 07/01/2011 (P)
(5) 10.62 ft on 07/11/1995 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 4.37 ft on 10/13/1977
(2) 4.47 ft on 01/06/2001
(3) 4.53 ft on 03/08/1977
(4) 4.58 ft on 12/01/1981
(5) 4.70 ft on 11/20/1979
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.

Show FEMA's National Flood Hazard Layers

Zoom Level:16

	Gauge Location	Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.

Flood Impacts & Photos

If you notice any errors in the below information, please contact our Webmaster
13	Near record flooding in the Mason Valley-Yerington area. Significant flooding of homes and businesses in Yerington possible if breaches develop and the river spreads east. Extensive flooding of agricultural lands likely. Many primary and secondary roads flooded.
12.5	Major flooding in the Mason Valley-Yerington area. Extensive flooding of farm and pasture lands. Many roads flooded. Some portions of Yerington flooded if breaches develop and the river spreads east.
12	Major flooding in the Mason Valley-Yerington area. Some portions of Yerington flood if breaches develop and the river spreads east. Many roads flood. Extensive flooding of farmland and pasture near the river flood.
11.6	Major flooding of lowlands throughout the Mason Valley-Yerington area. Structures adjacent to river in floodplain may be damage if not protected. Mason Valley Widlife Management area likely inaccessible. Flooding of many secondary and some primary roads occurs.
11.3	Moderate flooding of lowlands to farm and pasture lands throughout the Mason Valley-Yerington area. Some low structures adjacent to river begin to flood. Several secondary and some primary roads flood. Exceeds flood peak of June 2017.
11	Moderate flooding of lowlands, pasture and farmland adjacent to river throughout Mason Valley-Yerington area. Several rural and some secondary public roads flood. Yards and basements of lowest homes adjacent to the river in Mason and Yerington begin flooding. Preventative sandbagging is necessary. Possible damage to irrigation structures and levees Similar to June 24, 2017 peak, and slightly higher than July 1, 2011 peak.
10.8	Minor flooding of lowlands...pasture and farmland adjacent to the river throughout the Mason Valley-Yerington area. Some rural roads flood. Preventative sandbagging of low structures in Mason and Yerington may be necessary as river rises, but limited flooding occurs. Some minor flooding of basements and yards in Mason. Similar level to floods of July 1 2011.
10.5	Minor flooding of lowlands, pasture, farmland and some rural roads in Mason Valley. Preventative sandbagging of lowest homes in Mason and Yerington should be done as river rises, but limited flooding occurs. There may be some minor flooding of yards and basements in Mason.
10.3	Minor flooding of lowlands,pasture and farmland in Mason Valley-Yerington area. Preventative sandbagging of lowest homes and businesses adjacent to river should begin if further rises are possible. Some flooding of rural roads, likely including Miller Lane.
10	Minor flooding of lowlands, pasture, cropland and some rural roads throughout the Mason Valley/Yerington area. No flooding of structures.
9.8	Flood Stage, Minor lowland flooding begins throughout Mason Valley-Yerington area, with some inundation of lowlands and rural roads.
9	Monitor Stage, near bank full conditions. No flooding in the Mason Valley-Yerington area.
Photos (1) Downstream View from Snyder Lane Bridge (2) Upstream View from Snyder Lane Bridge

About This Location

Latitude: 38.921250° N, Longitude: 119.191583° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	9.8 ft	Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum	Elevation (gauge height = 0)	Elevation (gauge height = flood stage)	Elevation information source
NAVD88	Not Available	Not Available	Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29	4426.0	Not Available	Older USGS topographic maps, NGVD29 benchmarks
MSL	Not Available	Not Available	Older USGS topographic maps, MSL benchmarks
Other	Not Available	Not Available

Current/Historical Observations:

U.S. Geological Survey (USGS) Data and Site Info for Mason - Snyder Lane

Additional Information

Short Period of Record, many missing and estimated years. ***Reported historic crest estimates have been normalized using USGS Rating 6.0 (as of 10/24/2023) due to previous channel, location and/or datum changes. For observed crests please go to:https://nwis.waterdata.usgs.gov/usa/nwis/peak/?site_no=10300600

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Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

NWS Information

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Reno, NV 89512-3900
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Page last modified: 2-Nov-2020 7:27 PM

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