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WALKER RIVER - MASON AT SNYDER LANE (MASN2)
Latitude:
38.92º N		Longitude:
119.19º W		Elevation:
4420 Feet
Location: Lyon County in NV
River Group: Eastern Sierra
Forecast Issued: Jan 06 2026 at 1:45 PM PST
Next Issuance: Jan 07 2026 at 9:00 AM PST

Action/
Monitor:
9.0 Ft		Minor
Flood:
9.8 Ft		Moderate
Flood:
11.0 Ft		Major
Flood:
11.6 Ft

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Please Note:
Graphical River Forecast - WALKER RIVER - MASON AT SNYDER LANE (MASN2)Graphical River Forecast - WALKER RIVER - MASON AT SNYDER LANE (MASN2)

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* 338 5.03 Apr 29, 2025
2024* 917 6.69 Jun 8, 2024
2023* 3,810 11.64 Jun 8, 2023
2022* 321 5.48 May 30, 2022
2021* 316 5.48 May 11, 2021
 Historical High Stage/Flow Events (Period of Record - April 1974 to Present)** - Ranked by Flow
1997* 3,900*** 12.72 Jan 04, 1997
2023* 3,810 11.64 Jun 8, 2023
2017* 2,910 10.94 Jun 24, 2017
1995* 2,980**** 11.57 Jul 11, 1995
1983* 2,790*** 11.31 Jun 19, 1983
2011* 2,420 10.77 Jul 01, 2011
 * Discharge affected by regulation or diversion.
 ** Break in data between Oct 1984 and Sept 2010.
 *** Prior to Sep 30, 1984 - gage location 0.1 mile downstream at different datum.
 **** Estimated using other gages and MASN2 rating #5.1

Location Photographs

ESRI™ Locator Map

Flood Impacts
13.0 FeetNear 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 FeetMajor 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.
12.0 FeetMajor 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 FeetMajor 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 FeetModerate 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.
11.0 FeetModerate 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 FeetMinor 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 FeetMinor 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 FeetMinor 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.
10.0 FeetMinor flooding of lowlands, pasture, cropland and some rural roads throughout the Mason Valley/Yerington area. No flooding of structures.
9.8 FeetFlood Stage, Minor lowland flooding begins throughout Mason Valley-Yerington area, with some inundation of lowlands and rural roads.
9.0 FeetMonitor Stage, near bank full conditions. No flooding in the Mason Valley-Yerington area.