Agate Flat Dam is a gravity dam located in Prairie County, Montana. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 32 ft32 ft tall and 1,331 ft long, taller than 74% 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 Agate Flat Dam
Agate Flat Dam is a dam in Prairie, Montana. The dam is owned by Doi BLM (federal). It impounds the Unnamed Drainage.
The dam stands 32 feet tall and stretches 1,331 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 183 acre-feet, and collects water from a drainage area of 7 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/05/2018.
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Location
| State | Montana |
| County | Prairie |
| River/Stream | Unnamed Drainage |
| Coordinates | 47.02588, -105.62624 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 32 ft |
| Dam Length | 1,331 ft |
Storage & Hydraulics
| NID Storage | 183 acre-ft |
| Max Storage | 183 acre-ft |
| Normal Storage | 41 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 7 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/05/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00764 |
| Federal ID | MT00764 |
| More Info | State Dam Safety Program |