Relief Reservoir Report

Last Updated: December 5, 2025

California relief is characterized by a variety of hydrological systems, including surface flow and snowpack.


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Summary

The state has experienced severe droughts in the past, leading to water scarcity and agricultural losses. However, thanks to the sophisticated water management systems in place, relief has been provided through reservoirs, canals, aqueducts, and groundwater recharge. The main water providers in California are the California State Water Project and the Central Valley Project, which supply water to urban, agricultural, and recreational areas. Additionally, snowpack in the Sierra Nevada Mountains serves as a vital source of water for the state, with winter storms providing the majority of the snowpack. Agriculture is a major user of water in California, with crops such as almonds, grapes, and lettuce requiring large quantities of water. Recreational uses include swimming, boating, and fishing.

Reservoir Details

Storage 24hr Change -0.28%
Percent of Normal 183%
Minimum 224.0 acre-ft
2014-01-26
Maximum 17,727.0 acre-ft
2012-06-09
Average 6,714 acre-ft
Dam_Height 140
Year_Completed 1909
Nid_Storage 15600
River_Or_Stream Summit Creek
Primary_Dam_Type Rockfill
Surface_Area 223
Hazard_Potential High
Dam_Length 560
Nid_Height 140
       
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.