Easy Retention Dam is a gravity dam located in Musselshell County, Montana, built in 1972. It carries a Low hazard potential classification.
Dam profile
NID height · 34 ft34 ft tall and 281 ft long, taller than 78% 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 concrete gravity section and the water level is illustrative.
About Easy Retention Dam
The primary purpose of Easy Retention 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 Doi BLM (federal). It impounds the Willow Ck./musselshell River near Mosby.
The dam stands 34 feet tall and stretches 281 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 212 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1972, the structure is well into its service life at over 50 years old.
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 07/20/2020.
At 34 feet, this dam is taller than 78% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Montana |
| County | Musselshell |
| Nearest City | Mosby |
| River/Stream | Willow Ck./musselshell River |
| Coordinates | 46.58657, -108.29396 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 34 ft |
| Dam Length | 281 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 212 acre-ft |
| Max Storage | 212 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 07/20/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03922 |
| Federal ID | MT03922 |
| More Info | State Dam Safety Program |