Lake Frey
Lake Frey is an earth dam located in Solano County, California, built in 1894. It carries a High hazard potential classification and has a fair condition assessment.
About Lake Frey
The primary purpose of Lake Frey is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Vallejo (local government). It impounds the Wild Horse Creek near Fairfield.
The dam stands 83 feet tall and stretches 575 feet across, creates a reservoir covering 62 acres, has a maximum storage capacity of 1,020 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1894, the structure is over a century old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 08/26/2025.
At 83 feet, this dam is taller than 97% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The California dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | California |
| County | Solano |
| Nearest City | Fairfield |
| River/Stream | Wild Horse Creek |
| Coordinates | 38.29210, -122.19130 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 83 ft |
| Dam Height | 83 ft |
| Dam Length | 575 ft |
| Year Completed | 1894 (132 years old) |
Storage & Hydraulics
| NID Storage | 1,020 acre-ft |
| Max Storage | 1,020 acre-ft |
| Surface Area | 62 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,021 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Vallejo |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 08/26/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00142 |
| Federal ID | CA00142 |
| More Info | State Dam Safety Program |