Plymouth Effluent Reservoir Report
Nearby: Vicini Shenandoah Lake
Last Updated: December 13, 2025
Plymouth Effluent, located in Amador County, California, is a significant earth dam completed in 1989 primarily for water supply purposes.
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Summary
With a height of 59 feet and a storage capacity of 247.7 acre-feet, this dam plays a crucial role in flood risk reduction, irrigation, and water supply in the region. Managed by the local government, the dam is state-regulated, inspected, and enforced by the Department of Water Resources and Safety of Dams.
The dam's location near Tr L Indian Cr in Bridge House, California, makes it a key infrastructure for water management in the area. With a satisfactory condition assessment, the Plymouth Effluent dam has a significant hazard potential and undergoes regular inspections to ensure its structural integrity and safety. The dam's emergency action plan status and risk assessment measures are currently not available, emphasizing the need for ongoing monitoring and management to mitigate potential risks and ensure the safety of the community and surrounding areas.
Overall, Plymouth Effluent stands as a critical water resource infrastructure in California, serving multiple purposes and contributing to the region's water supply reliability. As an essential component of the local government's water management strategy, the dam's structural integrity, regulatory compliance, and emergency preparedness are key factors in ensuring the long-term sustainability and safety of water resources in the area. Climate and water resource enthusiasts can appreciate the role of Plymouth Effluent in managing water supply, irrigation, and flood risk reduction, highlighting the importance of effective infrastructure planning and management in addressing water challenges in the region.
Year Completed |
1989 |
Dam Length |
545 |
Dam Height |
59 |
River Or Stream |
Tr L Indian Cr |
Primary Dam Type |
Earth |
Surface Area |
12.7 |
Hydraulic Height |
54.5 |
Drainage Area |
0.33 |
Nid Storage |
247.7 |
Hazard Potential |
Significant |
Nid Height |
59 |
Seasonal Comparison
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Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Plymouth Effluent