Manley #1
Manley #1 is an earth dam located in Powell County, Montana, built in 1964. It carries a Low hazard potential classification.
About Manley #1
The primary purpose of Manley #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John Manley (private). It impounds the Douglas Creek near Helmvill.
The dam stands 10 feet tall and stretches 100 feet across, has a maximum storage capacity of 54 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1964, 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.
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Location
| State | Montana |
| County | Powell |
| Nearest City | Helmvill |
| River/Stream | Douglas Creek |
| Coordinates | 46.78410, -113.13270 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 100 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 54 acre-ft |
| Max Storage | 54 acre-ft |
| Normal Storage | 18 acre-ft |
| Drainage Area | 16 sq mi |
| Max Discharge | 950 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | JOHN MANLEY |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01227 |
| Federal ID | MT01227 |
| More Info | State Dam Safety Program |