Van Arsdale Reservoir 24hr Avg Reservoir Report

Reservoir Report

California

Nearby: Bevans Creek Scott

Last Updated: December 5, 2025

Van Arsdale Reservoir is located in Mendocino County, California, and is a crucial source of water for both agricultural and municipal purposes.

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Summary

It was created in 1958, as part of the Potter Valley Project, which involves diverting water from the Eel River into the Russian River. The reservoir has a capacity of 30,000 acre-feet and is fed by the East Branch Russian River, which is primarily supplied by snowmelt from the Mendocino National Forest. In addition, the reservoir receives water from the diversion tunnel that connects it to the Eel River. The 24-hour average for the reservoir is closely monitored by the Sonoma County Water Agency, which manages the water supply for multiple county agencies, including agricultural and recreational users.

Reservoir Details

Storage 24hr Change	0.51%
Percent of Normal	95%
Minimum	164.0 acre-ft 2007-05-24
Maximum	877.0 acre-ft 2019-02-27
Average	210 acre-ft

Seasonal Comparison

Storage Levels

Pool Elevation Levels

Top Conserv Storage Levels

Inflow Levels

Weather Forecast

Nearby Streamflow Levels

Ef Russian R Nr Calpella Ca 25.2cfs	25cfs
Outlet C Nr Willits Ca 4.47cfs	4cfs
Ef Russian R Nr Ukiah Ca 156cfs	156cfs
Russian R Nr Ukiah Ca 0.03cfs	0cfs
Willits C Ab Lk Emily Nr Willits Ca 0.02cfs	0cfs
Russian R Nr Talmage Ca 167.0cfs	167cfs

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.