Herrin Lake
Herrin Lake is an earth dam located in Lewis and Clark County, Montana, built in 1949. It carries a Low hazard potential classification.
About Herrin Lake
The primary purpose of Herrin Lake 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 State Of Montana, D.n.r.c., T.l.m.d. (state). It impounds the Tr-willow Creek near Cottonwood.
The dam stands 15 feet tall and stretches 100 feet across, and has a maximum storage capacity of 69 acre-feet. Completed in 1949, 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.
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Location
| State | Montana |
| County | Lewis and Clark |
| Nearest City | Cottonwood |
| River/Stream | Tr-willow Creek |
| Coordinates | 46.92290, -112.68890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 100 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 69 acre-ft |
| Max Storage | 69 acre-ft |
| Normal Storage | 36 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | STATE OF MONTANA, D.N.R.C., T.L.M.D. |
| Owner Type | State |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03683 |
| Federal ID | MT03683 |
| More Info | State Dam Safety Program |