Saint Marys Diversion Dam
Saint Marys Diversion Dam is a concrete dam located in Glacier County, Montana, built in 1915. It carries a Low hazard potential classification.
About Saint Marys Diversion Dam
The primary purpose of Saint Marys 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 Saint Mary River.
The dam stands 29 feet tall and stretches 198 feet across, and has a maximum storage capacity of 100 acre-feet. Completed in 1915, 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. The most recent inspection on record was 07/29/2021.
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Location
| State | Montana |
| County | Glacier |
| Nearest City | None |
| River/Stream | Saint Mary River |
| Coordinates | 48.85210, -113.41590 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 198 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Normal Storage | 100 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 07/29/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT04010 |
| Federal ID | MT04010 |
| More Info | State Dam Safety Program |