Hanley is an earth dam located in Carter County, Montana, built in 1936. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 504 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Hanley
The primary purpose of Hanley is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Xx Land Co (private). It impounds the Spring Creek near Ismay.
The dam stands 15 feet tall and stretches 504 feet across, and has a maximum storage capacity of 579 acre-feet. Completed in 1936, the structure is well-established, with more than 75 years of service.
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 | Carter |
| Nearest City | Ismay |
| River/Stream | Spring Creek |
| Coordinates | 46.10370, -104.60500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 504 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 579 acre-ft |
| Max Storage | 579 acre-ft |
| Normal Storage | 172 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Xx Land Co |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00096 |
| Federal ID | MT00096 |
| More Info | State Dam Safety Program |