Municipal Reservoir Report

Last Updated: December 5, 2025

Municipal, also known as Suisun Reservoir, is a private water supply structure located in Mankas Corner, California.


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Summary

The dam was completed in 1939 and stands at a height of 56 feet, with a maximum storage capacity of 169 acre-feet. It serves as a critical water source for the area, with a primary purpose of water supply. The dam is earth-filled and regulated by the California Department of Water Resources and Safety of Dams.

With a drainage area of 0.43 square miles and a surface area of 10 acres, Municipal plays a significant role in the region's water management. The dam has a high hazard potential but is currently in satisfactory condition, as assessed in September 2017. Regular inspections are conducted, with the most recent one taking place in June 2020. The Emergency Action Plan (EAP) for the dam was last revised in March 2021, ensuring that necessary guidelines and measures are in place for emergency situations.

Overall, Municipal serves as a vital component of the water infrastructure in Solano County, California. Its strategic location on Tr Suisun Creek and reliable water storage capacity make it a key asset for water resource management in the region. As climate change continues to impact water availability, structures like Municipal play a crucial role in ensuring a sustainable and secure water supply for the community.

Year Completed

1939

Dam Length

430

Dam Height

56

River Or Stream

Tr Suisun Crk

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

51.5

Drainage Area

0.43

Nid Storage

169

Hazard Potential

High

Nid Height

56
       
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.