Stevens Creek Reservoir Reservoir Report

Last Updated: December 5, 2025

Stevens Creek Reservoir is a man-made reservoir located in the Santa Cruz Mountains of California.


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Summary

The reservoir was created in 1935 by the construction of a dam on Stevens Creek, which is a tributary of the San Francisco Bay. The reservoir is managed by the Santa Clara Valley Water District and serves as a primary drinking water source for the cities of Cupertino, Mountain View, and Sunnyvale. The hydrology of the reservoir is influenced by the surrounding watershed, which includes both surface flow and snowpack from the nearby mountains. The reservoir is also used for recreation, including fishing, boating, and hiking, and there are several agricultural areas surrounding the reservoir. In recent years, the reservoir has experienced lower water levels due to drought conditions and increased water usage.

Reservoir Details

Storage 24hr Change 0.0%
Percent of Normal 330%
Minimum 130.0 acre-ft
2021-09-05
Maximum 7.03109296229e+16 acre-ft
2023-06-15
Average 908 acre-ft
Dam_Height 132
Hydraulic_Height 112.76
Drainage_Area 17.5
Year_Completed 1935
Nid_Storage 3800
River_Or_Stream Stevens Creek
Primary_Dam_Type Earth
Surface_Area 95
Hazard_Potential High
Dam_Length 1080
Nid_Height 132
       
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.