Zimmerman Retention Dam #1 is a gravity dam located in Petroleum County, Montana, built in 2003. It carries a Low hazard potential classification.
Dam profile
NID height · 19 ft19 ft tall and 179 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 Zimmerman Retention Dam #1
The primary purpose of Zimmerman Retention Dam #1 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 Flatwillow Ck./musselshell Riv near Mosby.
The dam stands 19 feet tall and stretches 179 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 103 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2003, the structure is relatively new.
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 11/09/2019.
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Location
| State | Montana |
| County | Petroleum |
| Nearest City | Mosby |
| River/Stream | Flatwillow Ck./musselshell Riv |
| Coordinates | 46.80431, -108.61192 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 19 ft |
| Dam Length | 179 ft |
| Year Completed | 2003 (23 years old) |
Storage & Hydraulics
| NID Storage | 103 acre-ft |
| Max Storage | 103 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 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 | 11/09/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02231 |
| Federal ID | MT02231 |
| More Info | State Dam Safety Program |