West Pre-sedimentation Basin
West Pre-sedimentation Basin is an earth dam located in Wagoner County, Oklahoma, built in 1966. It carries a High hazard potential classification and has a satisfactory condition assessment.
About West Pre-sedimentation Basin
The primary purpose of West Pre-sedimentation Basin 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 Broken Arrow Municipal Authority (local government). It impounds the Verdigris River-old Channel near Broken Arrow.
The dam stands 22 feet tall and stretches 3,650 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 340 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1966, 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 11/29/2022.
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 | Broken Arrow |
| River/Stream | Verdigris River-old Channel |
| Coordinates | 36.06889, -95.58083 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 3,650 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 340 acre-ft |
| Max Storage | 340 acre-ft |
| Normal Storage | 198 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 17 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | BROKEN ARROW MUNICIPAL AUTHORITY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/29/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | OK30393 |
| Federal ID | OK30393 |
| More Info | State Dam Safety Program |