Anchor Lake North Dam is a rockfill dam located in Beaverhead County, Montana, built in 1904. It carries a Significant hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic rockfill embankment section and the water level is illustrative.
About Anchor Lake North Dam
The primary purpose of Anchor Lake North Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Beaverhead Water Co (private). It impounds the Tr-birch Creek near Twin Bridges.
The dam stands 12 feet tall, creates a reservoir covering 49 acres, has a maximum storage capacity of 510 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1904, the structure is over a century old.
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. The most recent inspection on record was 09/20/1979. That was over 47 years ago.
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Location
| State | Montana |
| County | Beaverhead |
| Nearest City | Twin Bridges |
| River/Stream | Tr-birch Creek |
| Coordinates | 45.43466, -112.99909 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 510 acre-ft |
| Max Storage | 510 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 49 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 194 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Beaverhead Water Co |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/20/1979 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01483 |
| Federal ID | MT01483 |
| More Info | State Dam Safety Program |