Spartan/playfair Park Retention Basins
Spartan/playfair Park Retention Basins is an earth dam located in Missoula County, Montana, built in 2003. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Spartan/playfair Park Retention Basins
The primary purpose of Spartan/playfair Park Retention Basins 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 Missoula (local government). It impounds the Offstream near Missoula.
The dam stands 8 feet tall and stretches 5,520 feet across, and has a maximum storage capacity of 150 acre-feet. Completed in 2003, the structure is relatively new.
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 10/31/2024.
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 | Missoula |
| Nearest City | Missoula |
| River/Stream | Offstream |
| Coordinates | 46.83833, -114.01051 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 5,520 ft |
| Year Completed | 2003 (23 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 115 acre-ft |
| Max Discharge | 75 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | CITY OF MISSOULA |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/31/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MT03856 |
| Federal ID | MT03856 |
| More Info | State Dam Safety Program |