Finnon Lake
Finnon Lake is an earth dam located in El Dorado County, California, built in 2012. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Finnon Lake
The primary purpose of Finnon Lake 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 Mosquito Volunteer Fire Department (public utility). It impounds the Jay Bird Creek.
The dam stands 46 feet tall and stretches 830 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 400 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2012, the structure is relatively new.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 04/22/2025.
At 46 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | California |
| County | El Dorado |
| River/Stream | Jay Bird Creek |
| Coordinates | 38.79780, -120.75270 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 46 ft |
| Dam Height | 46 ft |
| Dam Length | 830 ft |
| Year Completed | 2012 (14 years old) |
Storage & Hydraulics
| NID Storage | 400 acre-ft |
| Max Storage | 400 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Mosquito Volunteer Fire Department |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/22/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00024 |
| Federal ID | CA00024 |
| More Info | State Dam Safety Program |