Willow Creek Wtrshd Site A-1
Willow Creek Wtrshd Site A-1 is an earth dam located in Ray County, Missouri, built in 1975. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Willow Creek Wtrshd Site A-1
The primary purpose of Willow Creek Wtrshd Site A-1 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 Willow Creek Wtrsd Subds (local government). It impounds the Willow Creek near Henrietta.
The dam stands 43 feet tall and stretches 1,100 feet across, creates a reservoir covering 29 acres, has a maximum storage capacity of 2,000 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1975, 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 04/07/2020.
At 43 feet, this dam is taller than 89% of dams nationwide.
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 Missouri 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 | Missouri |
| County | Ray |
| Nearest City | Henrietta |
| River/Stream | Willow Creek |
| Coordinates | 39.24538, -93.99447 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 42 ft |
| Dam Length | 1,100 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 2,000 acre-ft |
| Max Storage | 2,000 acre-ft |
| Normal Storage | 142 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 5,633 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | WILLOW CREEK WTRSD SUBDS |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/07/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO11084 |
| Federal ID | MO11084 |
| More Info | State Dam Safety Program |