Hook #55 is an earth dam located in Rosebud County, Montana, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 33 ft33 ft tall and 840 ft long, taller than 76% 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 embankment section and the water level is illustrative.
About Hook #55
The primary purpose of Hook #55 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Hook Ranch (private). It impounds the Sand Butte Coulee near Thurlow.
The dam stands 33 feet tall and stretches 840 feet across, and has a maximum storage capacity of 437 acre-feet. Completed in 1958, 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.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Montana |
| County | Rosebud |
| Nearest City | Thurlow |
| River/Stream | Sand Butte Coulee |
| Coordinates | 46.39460, -106.36650 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 840 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 437 acre-ft |
| Max Storage | 437 acre-ft |
| Normal Storage | 352 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Hook Ranch |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00059 |
| Federal ID | MT00059 |
| More Info | State Dam Safety Program |