Sullivan Dam
Sullivan Dam is an earth dam located in Toole County, Montana, built in 1967. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Sullivan Dam
The primary purpose of Sullivan Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by City Of Shelby (local government). It impounds the Tr-marias near Shelby.
The dam stands 68 feet tall and stretches 750 feet across, creates a reservoir covering 33 acres, has a maximum storage capacity of 1,470 acre-feet, and collects water from a drainage area of 2,048 square miles. Completed in 1967, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/08/2021.
At 68 feet, this dam is taller than 96% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Montana dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Montana |
| County | Toole |
| Nearest City | Shelby |
| River/Stream | Tr-marias |
| Coordinates | 48.52420, -111.85410 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 68 ft |
| Dam Height | 49 ft |
| Dam Length | 750 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 1,470 acre-ft |
| Max Storage | 1,470 acre-ft |
| Normal Storage | 360 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 2,048 sq mi |
| Max Discharge | 3,150 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | CITY OF SHELBY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/08/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MT02004 |
| Federal ID | MT02004 |
| More Info | State Dam Safety Program |