Lagoon Valley County Park Reservoir Report

Last Updated: December 5, 2025

Lagoon Valley County Park, located in Vacaville, California, is a stunning park that serves as both a recreational destination and a vital water supply source.


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Summary

This park is home to the Lagoon Creek, which feeds into the Tr Laguna Creek, making it an essential part of the local water system. The park's primary purpose is water supply, with a dam that was completed in 1981 standing at a height of 13 feet and providing a storage capacity of 780 acre-feet.

The dam at Lagoon Valley County Park is classified as an Earth dam, and its low hazard potential and satisfactory condition assessment make it a safe and reliable structure. With a surface area of 105 acres and a drainage area of 2.5 square miles, the park offers not only water-related activities but also ample space for outdoor recreation. The park's proximity to the city of Vacaville makes it a popular destination for both locals and visitors looking to enjoy nature and appreciate the importance of water resource management in a changing climate.

Managed by the local government, Lagoon Valley County Park is a well-maintained and regulated site, with state jurisdiction and oversight ensuring the safety and sustainability of its water supply infrastructure. Whether you're interested in exploring the area's natural beauty, learning about water conservation, or simply enjoying a day outdoors, Lagoon Valley County Park offers a unique blend of environmental education and recreational opportunities for water resource and climate enthusiasts alike.

Year Completed

1981

Dam Length

5200

Dam Height

13

River Or Stream

Tr Laguna Creek

Primary Dam Type

Earth

Surface Area

105

Hydraulic Height

8.5

Drainage Area

2.5

Nid Storage

780

Hazard Potential

Low

Nid Height

13
       
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.