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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 Nevada		Bulletin Group: Eastern Sierra		River Group: Eastern Sierra

Issuance Time:

Dec 08, 2023 at 7:34 AM PST

Monitor Stage: 9.0 Feet

Flood Stage: 9.8 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 File Download (Data in kcfs): MASN2

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		Official Forecast (Deterministic)

		Prob. of Threshold Exceedance
		Model Traces

What information is considered in this forecast?

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Upstream Photo	Gage House Photo	Downstream Photo

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Impacts - E19 Information
9.0 Feet	Monitor Stage, near bankfull conditions. No flooding in the Mason Valley-Yerington area.
9.8 Feet	Flood Stage. Minor lowland flooding begins throughout Mason Valley-Yerington area with some inundation of lowlands and rural roads.
10.0 Feet	Minor flooding of lowlands, pasture, cropland, and some rural roads throughout the Mason Valley-Yerington area. No flooding of structures of roads.
10.3 Feet	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.
10.5 Feet	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.
10.8 Feet	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.
11.0 Feet	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.
11.3 Feet	Moderate flooding of lowlands, 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.
11.6 Feet	Major flooding of lowlands throughout the Mason Valley-Yerington area. Structures adjacent to river in floodplain may be damaged if not protected. Flooding of many secondary and some primary roads occurs.
12.0 Feet	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.
12.5 Feet	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.
13.0 Feet	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.

Official 7 Day National Weather Service Forecast (NVZ001)

Today: Partly cloudy in the morning then clearing. Highs 33 to 43. Northwest winds 10 to 15 mph.

Tonight: Clear. Lows 15 to 25. North winds around 10 mph in the evening becoming light.

Saturday: Sunny. Highs 39 to 44. Light winds becoming southeast around 10 mph in the afternoon.

Saturday Night: Partly cloudy in the evening then becoming mostly cloudy. Lows 22 to 32. Southeast winds 10 to 15 mph.

Sunday: Mostly cloudy. Highs 47 to 57. Southeast winds 10 to 15 mph.

Sunday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 25 to 35.

Monday and Monday Night: Partly cloudy. Highs 44 to 54. Lows 22 to 32.

Tuesday through Wednesday: Clear. Highs 39 to 49. Lows 19 to 29.

Wednesday Night and Thursday: Partly cloudy. Lows 20 to 30. Highs 44 to 49.

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