Upper Little Black Watershed Dam D-7, also known as Site D-7, is a local government-owned Earth dam located in Naylor, Missouri.
Wind
Humidity
Designed by the USDA NRCS and completed in 1990, this dam serves the primary purpose of flood risk reduction along the Last Chance Hollow stream. With a height of 34.8 feet and a length of 700 feet, the dam has a maximum storage capacity of 429 acre-feet and a normal storage capacity of 106 acre-feet, covering a surface area of 15 acres and draining a watershed area of 1025 acres.
Despite its low hazard potential and moderate risk assessment, Upper Little Black Watershed Dam D-7 has not been inspected since July 1993 and is currently not rated in terms of condition assessment. The dam features an uncontrolled spillway with a width of 30 feet and no outlet gates. While it lacks regular state regulation, inspection, and enforcement, the dam remains crucial for managing flood risk in the region. As a key structure in the local water resource management system, its maintenance and monitoring are essential for ensuring the safety and integrity of the surrounding communities and ecosystems in Ripley County, Missouri.
Year Completed |
1990 |
Dam Length |
700 |
Dam Height |
34.8 |
River Or Stream |
LAST CHANCE HOLLOW |
Primary Dam Type |
Earth |
Surface Area |
15 |
Hydraulic Height |
32 |
Drainage Area |
1025 |
Nid Storage |
429 |
Structural Height |
44 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
44 |
Little Black River Below Fairdealing
|
113cfs |
Current River At Doniphan
|
1900cfs |
Black River At Poplar Bluff
|
858cfs |
Black River Near Corning
|
789cfs |
Black River At Leeper
|
508cfs |
St. Francis River At Wappapello
|
695cfs |