East Park Reservoir Reservoir Report

Last Updated: December 5, 2025

East Park Reservoir is a man-made body of water situated in the foothills of the Northern California Coast Range.


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Summary

It was built by the Bureau of Reclamation in 1967 to store water from Stony Creek, a tributary of the Sacramento River, for agricultural purposes. The reservoir has a capacity of 150,000 acre-feet and covers an area of 11,500 acres. It provides irrigation water to over 36,000 acres of farmland in Colusa and Glenn Counties. The reservoir is also a popular recreational area, attracting campers, anglers, and boaters. The hydrology of the reservoir is primarily dependent on the snowpack in the mountains to the west and the surface flow of Stony Creek. The reservoir is managed by the Bureau of Reclamation, who oversee the water supply and recreation activities.

Reservoir Details

Storage 24hr Change -0.11%
Percent of Normal 154%
Minimum 213.0 acre-ft
2021-11-08
Maximum 52,511.0 acre-ft
2019-02-26
Average 31,246 acre-ft
Dam_Height 139
Hydraulic_Height 92
Drainage_Area 102
Year_Completed 1910
Nid_Storage 54300
Structural_Height 139
River_Or_Stream LITTLE STONY CREEK
Foundations Rock
Surface_Area 1820
Hazard_Potential High
Dam_Length 266
Primary_Dam_Type Concrete
Nid_Height 139
       
Seasonal Comparison
Storage Levels
Pool Elevation Levels
Top Conserv Storage Levels
Inflow Levels

Weather Forecast

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.