Duncan
Duncan is an earth dam located in Stephens County, Oklahoma, built in 1937. It carries a Significant hazard potential classification and has a fair condition assessment.
About Duncan
The primary purpose of Duncan is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Duncan (local government). It impounds the Fitzpatrick Creek near Velma.
The dam stands 45 feet tall and stretches 2,650 feet across, creates a reservoir covering 500 acres, and has a maximum storage capacity of 12,100 acre-feet. Completed in 1937, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 11/30/2017.
At 45 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Oklahoma |
| County | Stephens |
| Nearest City | Velma |
| River/Stream | Fitzpatrick Creek |
| Coordinates | 34.52151, -97.80906 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 2,650 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 12,100 acre-ft |
| Max Storage | 12,100 acre-ft |
| Normal Storage | 7,200 acre-ft |
| Surface Area | 500 acres |
| Max Discharge | 15,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF DUNCAN |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/30/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OK10023 |
| Federal ID | OK10023 |
| More Info | State Dam Safety Program |