Northern Pacific Reservoir Dam
High HazardNot Rated ConditionEmergency Action Plan: Not Required
Location
| State | Montana |
| County | Jefferson |
| Nearest City | EAST HELENA |
| River/Stream | MCCLELLAN CREEK |
| Coordinates | 46.55407, -111.90546 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 107 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 173 acre-ft |
| Max Storage | 173 acre-ft |
| Normal Storage | 48 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 33 sq mi |
| Max Discharge | 800 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | ASH GROVE CEMENT |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |