CNRFC - Hydrology - Observed River/Reservoir Conditions

End of River Group

SUSAN RIVER - SUSANVILLE (SUSC1)

Latitude: 40.41º N	Longitude: 120.66º W	Elevation: 4190 Feet
Location: Lassen County in California		Bulletin Group: Eastern Sierra		River Group: Eastern Sierra

Action/Monitor: 10.5 Feet

Minor Flood: 12.0 Feet

Moderate Flood: 13.0 Feet

Major Flood: 14.0 Feet

Plot Type:

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View California Department of Water Resources Data for this station location.

Historical Mean Daily Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	1,597**	10.31	Feb 05, 2025
2024*	961**	8.63	Feb 19, 2024
2023*	1,810**	11.05	Dec 30, 2022
2022*	1,520**	10.30	Oct 25, 2021
2021*	106**	4.70	Feb 12, 2021
Historical High Stage/Flow Events (Period of Record - Discontinuous Jul 1951 to Present)**** - Ranked by Flow
1970*	5,850	8.89***	Jan 24, 1970
1997*	5,150**	11.75***	Jan 02, 1997
1986*	5,120	8.33***	Feb 17, 1986
1965*	5,100	7.30***	Dec 22, 1964
1982*	4,560	7.95***	Nov 23, 1981
1963*	3,900	15.10***	Jan 31, 1963
* Discharge affected by regulation or diversion Estimated flow (Not Official) * USGS gage located 0.5 mile upstream at different datum. **** Most recent record back to Jul 1951 (missing 1995 to 2000) with segmented periods back to Jun 1900

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
18.5 Feet	Record flooding from Susanville to Honey Lake...including Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Extensive damage to homes...businesses...schools...roads... bridges and water systems throughout Honey Lake Valley. Transportation in and out of valley cut off as US Highway 395 and Highway 36 are flooded or washed out. Extensive power...phone...and rural water system impacts. Like record flood of January 24 1970.
18.0 Feet	Near record flooding from Susanville to Honey Lake...including Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Extensive damage to homes...businesses...schools...roads...bridges and water systems in flood plain throughout Honey Lake Valley. Transportation in and out of Honey Lake Valley is cut off as US Highway 395 and Highway 36 are flooded or washed out. Extensive power...phone and rural water system impacts. Only exceeded by flood of January 24 1970.
17.5 Feet	Near record flooding from Susanville to Honey Lake...including Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Severe damage to homes...businesses...schools... roadways...bridges and water systems in flood plain throughout Honey Lake Valley. Transportation in valley difficult as US Highway 395 and Highway 36 are flooded or washed out. Extensive power...phone and rural water system impacts. Slightly higher than floods of February 17 1986 and January 2 1997.
17.0 Feet	Major flood damage from Susanville to Honey Lake...including Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Homes...businesses...schools... roadways...bridges and water systems flooded throughout Honey Lake Valley. Transportation very difficult as US Highway 395 and Highway 36 are flooded or washed out. Extensive power...phone and rural water system impacts. Slightly less severe than floods of December 22 1964...February 17 1986 and January 2 1997.
16.5 Feet	Major flood damage from Susanville to Honey Lake...including Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Homes...businesses...schools...roadways... bridges and water systems flooded throughout Honey Lake Valley. Extensive transportation...power... phone and rural water system impacts. US Highway 395 and Highway 36 flooded. Similar to November 23 1981 flood.
16.0 Feet	Major flooding from Susanville to Honey Lake...including Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Homes...businesses...schools...roadways and bridges flooded throughout Honey Lake Valley. Transportation impacts may be serious as US Highway 395 and Highway 36 are flooded. Extensive power...phone and rural water system impacts. Similar to November 23 1981 flood.
15.5 Feet	Major flood damage from Susanville to Honey Lake...including Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Flooding of homes...businesses and schools in flood plain throughout Honey Lake Valley...including Susanville. Extensive damage to transportation systems as roads...bridges and culverts are flooded or washed out. US Highway 395 is flooded. Major transportation...power...phone and rural water system impacts. Similar to January 31 1963 flood.
15.0 Feet	Major flooding in Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield areas. Major flooding in Susanville from Lassen Street downstream along Riverside Drive and from Main Street...Highway 36...on north to railroad tracks on south. Serious flood impacts to homes...businesses...schools...roads and bridges throughout Honey Lake Valley. US Highway 395 flooded. Serious transportation...power...phone and rural water system impacts. Similar to January 31 1963 and January 13 1980 floods.
14.5 Feet	Major flooding in Susanville, Johnstonville, Leavitt Lake, Standish, and Litchfield areas in Honey Lake Valley. Susanville flooded from Lassen Street downstream along Riverside Drive and from Main Street (Highway 36) on north to railroad tracks on south. Serious flood impacts to homes, businesses, schools, roads, and bridges throughout Honey Lake Valley. US Highway 395 flooded. Serious transportation impacts, moderate impacts to power, phone, and rural water systems. Similar to 12/23/1955 flood.
14.0 Feet	Major flooding in Susanville...Johnstonville...Leavitt Lake...Standish...Litchfield. Susanville floods from Lassen Street downstream along Riverside Drive and from Main St...Highway 36...on north to railroad tracks on south. Top of K-rail flood wall on Carroll Street. Homes...businesses...schools...roads and bridges in the Honey Lake Valley flooded. Serious transportation impacts. Impacts to power...phone and rural water systems begin. Similar to December 31 2005 and February 24 1958 floods.
13.5 Feet	Moderate flooding in Susanville...Johnstonville...Leavitt Lake...Standish and Litchfield.Susanville floods from Lassen Street downstream along Riverside Drive and from Cornell/River Street on north to Hood Street/Sunkist Drive on south. River up to bottom of Lassen Street bridge. Several homes along river have minor to moderate flooding. Many roads and bridges in Honey Lake Valley flood...moderate transportation impacts. Like December 2 2012...March 30 1974 and January 21 1969 floods.
13.0 Feet	Moderate flooding in Susanville from Lassen Street downstream along Riverside Drive. Some homes along river have moderate flood affects...especially on Carroll Street. Significant lowland flooding below Susanville in Johnstonville...Leavitt Lake...Standish and Litchfield areas. Rural roads and bridges in these areas flood. Similar to flood of March 13 1983.
12.5 Feet	Minor to moderate flooding in Susanville from Lassen Street downstream along Riverside Drive. Several homes along river affected...especially on Carroll Street. Moderate lowland flooding below Susanville in Johnstonville...Leavitt Lake...Standish and Litchfield areas. Rural roads and bridges begin to flood in these areas.
12.0 Feet	Flood Stage. Several homes on Carroll Street in Susanville begin to flood. Local flooding in Susanville from Lassen Street downstream along Riverside Drive...especially below Piute Creek which enters river near Alexander Drive. Moderate lowland flooding below Susanville in Johnstonville...Leavitt Lake...Standish... and Litchfield areas. Some rural roads affected by flooding.
11.5 Feet	Localized minor to moderate lowland flooding below Susanville in the Johnstonville...Leavitt Lake... Standish and Litchfield rural areas.
11.0 Feet	Local minor lowland flooding below Susanville in Johnstonville...Leavitt Lake...Standish and Litchfield rural areas.
10.5 Feet	Those along river should begin careful monitoring of river and keep informed of forecast updates. Localized minor lowland flooding below Susanville in Johntonville...Leavitt Lake...Standish and Litchfield rural areas.

Official 7 Day National Weather Service Forecast (CAZ071)

Today: Rain and snow in the morning, then rain and snow likely in the afternoon. Snow level 6500 feet. Snow accumulation up to 2 inches. Highs 40 to 50. Southeast winds 10 to 15 mph.

Tonight: Mostly cloudy with a chance of rain and snow. Snow level 6000 feet. Snow accumulation up to 1 inch. Lows 26 to 36. Light winds.

Tuesday: Mostly cloudy in the morning then clearing. Highs 46 to 56. Light winds.

Tuesday Night: Partly cloudy in the evening then becoming clear. Lows 23 to 33. Light winds.

Wednesday: Partly cloudy in the morning then clearing. Highs 48 to 53. Light winds.

Wednesday Night: Partly cloudy with a slight chance of rain in the evening, then mostly cloudy with a chance of rain and snow after midnight. Lows 25 to 35.

Thursday: Rain and snow likely. Highs 39 to 49.

Thursday Night: Mostly cloudy with a slight chance of rain and snow in the evening, then partly cloudy with a slight chance of snow after midnight. Lows 23 to 33.

Friday through Sunday: Partly cloudy. Highs 52 to 57. Lows 22 to 32.

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.

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