Wister Dam
Wister Dam is an earth dam located in Le Flore County, Oklahoma, built in 1949. It carries a High hazard potential classification.
About Wister Dam
The primary purpose of Wister 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 Usace - Tulsa District (federal). It impounds the Poteau River near Poteau.
The dam stands 99 feet tall and stretches 5,700 feet across, creates a reservoir covering 6,745 acres, has a maximum storage capacity of 427,481 acre-feet, and collects water from a drainage area of 993 square miles. Completed in 1949, the structure is well-established, with more than 75 years of service.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/22/2022.
At 99 feet, this dam is taller than 98% 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 Oklahoma 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 | Oklahoma |
| County | Le Flore |
| Nearest City | Poteau |
| River/Stream | Poteau River |
| Coordinates | 34.94175, -94.71696 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 99 ft |
| Dam Height | 99 ft |
| Dam Length | 5,700 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 427,481 acre-ft |
| Max Storage | 427,481 acre-ft |
| Normal Storage | 51,589 acre-ft |
| Surface Area | 6,745 acres |
| Drainage Area | 993 sq mi |
| Max Discharge | 170,910 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - Tulsa District |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 06/22/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OK10315 |
| Federal ID | OK10315 |
| More Info | State Dam Safety Program |