Vineyard Subdivision Reservoir Report

Last Updated: December 23, 2025

Vineyard Subdivision, also known as Vineyard Lake, is a private water supply dam located in Geyserville, California.


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Summary

Built in 1962, this earth dam stands at 26 feet high and has a storage capacity of 245 acre-feet. The dam's primary purpose is to provide water for the surrounding area, with secondary purposes including recreation. It is regulated and permitted by the California Department of Water Resources and is subject to regular inspections to ensure its safety and proper functioning.

Situated on Tr Gill Creek in Sonoma County, Vineyard Subdivision plays a crucial role in water management and supply in the region. The dam has a significant hazard potential but has been assessed as satisfactory in condition as of September 2017. The inspection frequency is set at once per year, with the last inspection conducted in January 2020. Despite its age, the dam continues to serve its intended purposes effectively, highlighting the importance of proper maintenance and regulation in ensuring the safety and reliability of water resources in the area.

With its strategic location and vital role in water supply, Vineyard Subdivision serves as a key asset for the community of Geyserville and surrounding areas. Its satisfactory condition and adherence to regulatory standards demonstrate a commitment to water resource management and the safety of dams. As water resource and climate enthusiasts, understanding the infrastructure and maintenance of dams like Vineyard Subdivision is essential for ensuring the sustainable and efficient utilization of water for both human consumption and recreational activities in the region.

Year Completed

1962

Dam Length

1660

Dam Height

26

River Or Stream

Tr Gill Creek

Primary Dam Type

Earth

Surface Area

25

Hydraulic Height

22.5

Drainage Area

0.08

Nid Storage

245

Hazard Potential

Significant

Nid Height

26
       
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.