Fort Gibson Dam - Dike 11
Fort Gibson Dam - Dike 11 is a gravity dam located in Wagoner County, Oklahoma, built in 1949. It carries a High hazard potential classification.
About Fort Gibson Dam - Dike 11
The primary purpose of Fort Gibson Dam - Dike 11 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 Grand River near Fort Gibson.
The dam stands 8 feet tall and stretches 1,375 feet across, creates a reservoir covering 19,900 acres, has a maximum storage capacity of 464,950 acre-feet, and collects water from a drainage area of 12,494 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 10/22/2019.
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 | Wagoner |
| Nearest City | Fort Gibson |
| River/Stream | Grand River |
| Coordinates | 36.00148, -95.37892 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 1,375 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 464,950 acre-ft |
| Max Storage | 464,950 acre-ft |
| Normal Storage | 365,200 acre-ft |
| Surface Area | 19,900 acres |
| Drainage Area | 12,494 sq mi |
| Max Discharge | 986,000 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - Tulsa District |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 10/22/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OK10314 |
| Federal ID | OK10314S011 |
| More Info | State Dam Safety Program |