Heenan Lake
Heenan Lake is an earth dam located in Alpine County, California, built in 1929. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Heenan Lake
The primary purpose of Heenan 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 California Department Of Fish And Wildlife (state). It impounds the Tr Efk Carson R.
The dam stands 39 feet tall and stretches 600 feet across, creates a reservoir covering 124 acres, has a maximum storage capacity of 3,100 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1929, the structure is well-established, with more than 75 years of service.
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 08/27/2025.
At 39 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | California |
| County | Alpine |
| River/Stream | Tr Efk Carson R |
| Coordinates | 38.65530, -119.66480 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 600 ft |
| Year Completed | 1929 (97 years old) |
Storage & Hydraulics
| NID Storage | 3,100 acre-ft |
| Max Storage | 3,100 acre-ft |
| Surface Area | 124 acres |
| Drainage Area | 4 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | California Department of Fish and Wildlife |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00641 |
| Federal ID | CA00641 |
| More Info | State Dam Safety Program |