Danville Reservoir Report

Last Updated: December 5, 2025

Located in Danville, California, this offstream earth dam serves as a crucial water supply structure for the area.


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Summary

Constructed in 1961, the Danville dam stands at a height of 75 feet with a storage capacity of 45 acre-feet. The dam has a high hazard potential but has been assessed as satisfactory in terms of condition, with the last inspection conducted in March 2021.

Managed by a public utility, the Danville dam falls under the regulatory oversight of the California Department of Water Resources (DWR) and the Safety of Dams program. With state permitting, inspection, and enforcement in place, the dam ensures the safety and reliability of the water supply for the community. In the event of an emergency, an Emergency Action Plan (EAP) may be in place, with the last revision dating back to January 2018.

Enthusiasts of water resources and climate in the Danville area can appreciate the vital role that the Danville dam plays in providing water to the region. With its strategic location and efficient design, this earth dam stands as a testament to the commitment to water supply infrastructure in California. Maintaining a balance between water resource management and environmental stewardship, the Danville dam continues to serve as a critical asset in the community's water supply network.

Year Completed

1961

Dam Length

765

Dam Height

75

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

71.4

Nid Storage

45

Hazard Potential

High

Nid Height

75
       
Seasonal Comparison

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.