Ler Twin Lake
Ler Twin Lake is an earth dam located in Napa County, California, built in 1985. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Ler Twin Lake
The primary purpose of Ler Twin 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 Juliana Mutual Water Company (private). It impounds the Tr Pope Creek.
The dam stands 18 feet tall and stretches 1,080 feet across, creates a reservoir covering 12 acres, and has a maximum storage capacity of 127 acre-feet. Completed in 1985, the structure is 41 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 01/30/2025.
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Location
| State | California |
| County | Napa |
| River/Stream | Tr Pope Creek |
| Coordinates | 38.64590, -122.41920 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 1,080 ft |
| Year Completed | 1985 (41 years old) |
Storage & Hydraulics
| NID Storage | 127 acre-ft |
| Max Storage | 127 acre-ft |
| Surface Area | 12 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Juliana Mutual Water Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/30/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01293 |
| Federal ID | CA01293 |
| More Info | State Dam Safety Program |