Ernie #1 Dam is a gravity dam located in Musselshell County, Montana. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 575 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Ernie #1 Dam
The primary purpose of Ernie #1 Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Doi BLM (federal). It impounds the Intermittent.
The dam stands 17 feet tall and stretches 575 feet across, creates a reservoir covering 80 acres, has a maximum storage capacity of 515 acre-feet, and collects water from a drainage area of 12 square miles.
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. The most recent inspection on record was 11/07/2018.
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Location
| State | Montana |
| County | Musselshell |
| River/Stream | Intermittent |
| Coordinates | 46.58418, -108.74177 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 17 ft |
| Dam Length | 575 ft |
Storage & Hydraulics
| NID Storage | 515 acre-ft |
| Max Storage | 515 acre-ft |
| Surface Area | 80 acres |
| Drainage Area | 12 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/07/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02431 |
| Federal ID | MT02431 |
| More Info | State Dam Safety Program |