Fountaingrove Reservoir Report

Last Updated: December 5, 2025

Fountaingrove, a water supply dam located in Santa Rosa, California, was completed in 1953 and is under the regulatory oversight of the Department of Water Resources for the safety of dams.


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Summary

The dam stands at a height of 38 feet and has a hydraulic height of 31.7 feet, with a storage capacity of 427 acre-feet. Its primary purpose is for water supply, serving irrigation and domestic water needs in the surrounding area.

The dam is situated on the Tr Mark West Creek and has a drainage area of 0.52 square miles. Despite being classified as having a high hazard potential, the condition assessment of Fountaingrove is reported as satisfactory as of September 2017. The dam has not undergone any modifications in recent years and is subject to regular inspections, with the last inspection conducted in September 2020. The emergency action plan for the dam was last revised in December 2015.

Fountaingrove remains a critical infrastructure for water resource management in Sonoma County, providing essential water supply services to the local community. With its secure condition assessment and regulatory compliance, the dam continues to play a vital role in ensuring water security and resource sustainability in the region. Water resource and climate enthusiasts will find Fountaingrove to be an intriguing case study in dam infrastructure management and the intersection of water supply needs with environmental stewardship.

Year Completed

1953

Dam Length

500

Dam Height

38

River Or Stream

Tr Mark West Cr

Primary Dam Type

Earth

Surface Area

33

Hydraulic Height

31.7

Drainage Area

0.52

Nid Storage

427

Hazard Potential

High

Nid Height

38
       
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.