I.u. Reservoir is an earth dam located in Blaine County, Montana, built in 1938. It carries a Low hazard potential classification.
Dam profile
NID height · 44 ft44 ft tall and 1,150 ft long, taller than 89% 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 I.u. Reservoir
The primary purpose of I.u. Reservoir is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by State of Montana, D.n.r.c., T.l.m.d. (state). It impounds the Cow Creek near No Town.
The dam stands 44 feet tall and stretches 1,150 feet across, and has a maximum storage capacity of 439 acre-feet. Completed in 1938, 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.
At 44 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Montana |
| County | Blaine |
| Nearest City | No Town |
| River/Stream | Cow Creek |
| Coordinates | 48.08600, -109.28890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 1,150 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 439 acre-ft |
| Max Storage | 439 acre-ft |
| Normal Storage | 330 acre-ft |
Ownership & Safety
| Purpose | Irrigation |
| Owner | State of Montana, D.n.r.c., T.l.m.d. |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00038 |
| Federal ID | MT00038 |
| More Info | State Dam Safety Program |