Blackfoot Detention Dam
Blackfoot Detention Dam is a gravity dam located in Carter County, Montana, built in 1959. It carries a Low hazard potential classification and has a unsatisfactory condition assessment.
About Blackfoot Detention Dam
The primary purpose of Blackfoot Detention 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 Mizpah Ck./powder River near Marmarth, North Dakota.
The dam stands 23 feet tall and stretches 3,600 feet across, creates a reservoir covering 88 acres, and has a maximum storage capacity of 707 acre-feet. Completed in 1959, 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. Its condition is rated unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. The most recent inspection on record was 08/30/2010. That was over 15 years ago.
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Location
| State | Montana |
| County | Carter |
| Nearest City | Marmarth, North Dakota |
| River/Stream | Mizpah Ck./powder River |
| Coordinates | 45.68335, -104.52969 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 23 ft |
| Dam Length | 3,600 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 707 acre-ft |
| Max Storage | 707 acre-ft |
| Surface Area | 88 acres |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Unsatisfactory |
| Last Inspection | 08/30/2010 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00611 |
| Federal ID | MT00611 |
| More Info | State Dam Safety Program |