Anita Dam is an earth dam located in Yellowstone County, Montana, built in 1937. It carries a Low hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 1,050 ft long, taller than 88% 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 Anita Dam
The primary purpose of Anita Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Bureau of Reclamation (federal). It impounds the Yellowstone River Tr near Pompeys Pillar.
The dam stands 42 feet tall and stretches 1,050 feet across, creates a reservoir covering 40 acres, has a maximum storage capacity of 570 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1937, 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. The most recent inspection on record was 08/30/2023.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Montana |
| County | Yellowstone |
| Nearest City | Pompeys Pillar |
| River/Stream | Yellowstone River Tr |
| Coordinates | 45.93210, -107.99940 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 1,050 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 570 acre-ft |
| Max Storage | 570 acre-ft |
| Normal Storage | 400 acre-ft |
| Surface Area | 40 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 1,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Bureau of Reclamation |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/30/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00567 |
| Federal ID | MT00567 |
| More Info | State Dam Safety Program |