Maine Prairie 3 Reservoir Report

Last Updated: December 5, 2025

Maine Prairie 3 is a public utility dam located in Solano, California, specifically on Ulatis Creek.


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Summary

Completed in 1965, this buttress-type dam stands at a height of 11 feet and has a maximum storage capacity of 96 acre-feet. The primary purpose of this dam is flood risk reduction, with secondary benefits including irrigation for the surrounding area.

Despite its age, Maine Prairie 3 has been well-maintained and is in satisfactory condition, with a low hazard potential according to the latest assessment in September 2017. The dam is regulated by the California Department of Water Resources and undergoes regular inspections to ensure its structural integrity and safety. In the event of an emergency, the dam has an Emergency Action Plan in place, although details on its preparedness and guidelines compliance are not specified in the data.

Overall, Maine Prairie 3 serves as a crucial infrastructure for flood risk reduction and water management in the region. With its history of effective operation and maintenance, this dam plays a vital role in protecting the surrounding communities and ensuring the sustainable use of water resources in Solano County, California.

Year Completed

1965

Dam Length

120

Dam Height

11

River Or Stream

Ulatis Creek

Primary Dam Type

Buttress

Surface Area

23

Hydraulic Height

9.7

Nid Storage

96

Hazard Potential

Low

Nid Height

11
       
Seasonal Comparison

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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.