La Herradura
La Herradura is an earth dam located in Napa County, California, built in 1948. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About La Herradura
La Herradura is a dam in Napa, California. The dam is owned by L.p.r.p. Legacy Trust (private). It impounds the Tr Conn Creek.
The dam stands 73 feet tall and stretches 285 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 110 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1948, 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 01/22/2025.
At 73 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | California |
| County | Napa |
| River/Stream | Tr Conn Creek |
| Coordinates | 38.51860, -122.41890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 73 ft |
| Dam Height | 73 ft |
| Dam Length | 285 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 110 acre-ft |
| Max Storage | 110 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | L.P.R.P. Legacy Trust |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/22/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00582 |
| Federal ID | CA00582 |
| More Info | State Dam Safety Program |