Vandalia Diversion Dam is a buttress dam located in Valley County, Montana, built in 1917. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 2,350 ft long, taller than 74% 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 concrete gravity section and the water level is illustrative.
About Vandalia Diversion Dam
The primary purpose of Vandalia Diversion 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 Milk River.
The dam stands 32 feet tall and stretches 2,350 feet across, creates a reservoir covering 100 acres, has a maximum storage capacity of 1,400 acre-feet, and collects water from a drainage area of 6,500 square miles. Completed in 1917, the structure is over a century 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 | Valley |
| Nearest City | None |
| River/Stream | Milk River |
| Coordinates | 48.37280, -106.97500 |
Physical Characteristics
| Dam Type | Buttress |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 2,350 ft |
| Year Completed | 1917 (109 years old) |
Storage & Hydraulics
| NID Storage | 1,400 acre-ft |
| Max Storage | 1,400 acre-ft |
| Normal Storage | 465 acre-ft |
| Surface Area | 100 acres |
| Drainage Area | 6,500 sq mi |
| Max Discharge | 52,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Bureau of Reclamation |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00584 |
| Federal ID | MT00584 |
| More Info | State Dam Safety Program |