Moskowite Reservoir Report

Last Updated: December 5, 2025

Moskowite, located in Napa, California, is a privately owned dam that plays a crucial role in water supply and irrigation in the region.


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Summary

Constructed in 1955, this earth-type dam stands at a height of 50 feet and has a hydraulic height of 44.3 feet. With a storage capacity of 472 acre-feet and a surface area of 29 acres, Moskowite serves as a vital resource for the surrounding area, ensuring water availability for agricultural and residential needs.

Managed by the Natural Resources Conservation Service, Moskowite is regulated by the California Department of Water Resources and undergoes regular inspections to ensure its safety and functionality. Despite its low hazard potential, the dam is maintained in satisfactory condition, with the last assessment conducted in September 2017. The dam's emergency action plan is up to date, and while it has not been modified in recent years, it continues to serve its primary purposes effectively, contributing to the overall water management system in the region.

Situated along the Tr Capell Creek, Moskowite not only provides essential water supply but also contributes to the overall ecological balance of the area. With its strategic location and reliable infrastructure, this dam exemplifies the importance of sustainable water resource management in mitigating the impacts of climate change and ensuring a secure water supply for present and future generations.

Year Completed

1955

Dam Length

900

Dam Height

50

River Or Stream

Tr Capell Creek

Primary Dam Type

Earth

Surface Area

29

Hydraulic Height

44.3

Drainage Area

0.92

Nid Storage

472

Hazard Potential

Low

Nid Height

50
       
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.