Hebgen Dam
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | Montana |
| County | Gallatin |
| Nearest City | Ennis, MT |
| River/Stream | Madison River |
| Coordinates | 44.86370, -111.33580 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 120 ft |
| Dam Height | 88 ft |
| Dam Length | 721 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 525,620 acre-ft |
| Max Storage | 525,620 acre-ft |
| Normal Storage | 386,000 acre-ft |
| Surface Area | 13,000 acres |
| Drainage Area | 905 sq mi |
| Max Discharge | 4,400 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | NorthWestern Energy |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/25/2021 |
| Emergency Action Plan | Yes |