Montana Lake is an earth dam located in Napa County, California, built in 2009. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 39 ft39 ft tall and 918 ft long, taller than 85% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Montana Lake
Montana Lake is a dam in Napa, California. The dam is owned by Terrence Wilson (private). It impounds the Tr Lake Curry.
The dam stands 39 feet tall and stretches 918 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 2009, the structure is relatively new.
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 04/24/2025.
At 39 feet, this dam is taller than 85% of dams nationwide.
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Location
| State | California |
| County | Napa |
| River/Stream | Tr Lake Curry |
| Coordinates | 38.37910, -122.15580 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 39 ft |
| Dam Height | 39 ft |
| Dam Length | 918 ft |
| Year Completed | 2009 (17 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Terrence Wilson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/24/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01460 |
| Federal ID | CA01460 |
| More Info | State Dam Safety Program |