Tub Lake Dam is an earth dam located in Beaverhead County, Montana, built in 1904. It carries a Significant hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 169 ft long. 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 Tub Lake Dam
The primary purpose of Tub Lake Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Beaverhead Water Co (private). It impounds the Birch Creek near Twin Bridges.
The dam stands 13 feet tall and stretches 169 feet across, creates a reservoir covering 17 acres, has a maximum storage capacity of 208 acre-feet, and collects water from a drainage area of 1 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 07/24/2014. That was over 12 years ago.
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Location
| State | Montana |
| County | Beaverhead |
| Nearest City | Twin Bridges |
| River/Stream | Birch Creek |
| Coordinates | 45.41826, -112.99736 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 169 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 208 acre-ft |
| Max Storage | 208 acre-ft |
| Normal Storage | 136 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 55 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Beaverhead Water Co |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/24/2014 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00822 |
| Federal ID | MT00822 |
| More Info | State Dam Safety Program |