Petrolia
High HazardPoor ConditionEmergency Action Plan: Yes
Location
| State | Montana |
| County | Petroleum |
| Nearest City | MOSBY |
| River/Stream | SOUTH FORK FLATWILLOW CREEK |
| Coordinates | 46.94100, -108.23590 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 76 ft |
| Dam Height | 76 ft |
| Dam Length | 3,635 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 14,170 acre-ft |
| Max Storage | 14,170 acre-ft |
| Normal Storage | 9,192 acre-ft |
| Surface Area | 515 acres |
| Drainage Area | 612 sq mi |
| Max Discharge | 10,200 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | PETROLIA IRRIGATION DISTRICT |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 04/26/2023 |
| Emergency Action Plan | Yes |