Bigfork Diversion Dam
High HazardPoor ConditionEmergency Action Plan: Yes
Location
| State | Montana |
| County | Flathead |
| Nearest City | Big Fork |
| River/Stream | Swan River |
| Coordinates | 48.06220, -114.05270 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 92 ft |
| Year Completed | 1910 (116 years old) |
Storage & Hydraulics
| NID Storage | 109 acre-ft |
| Normal Storage | 109 acre-ft |
| Surface Area | 73 acres |
| Drainage Area | 736 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | PacifiCorp |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 06/04/2025 |
| Emergency Action Plan | Yes |