Grassy Creek Watershed Dam G-40a is a vital structure designed by the USDA NRCS in Lewis County, Missouri, to serve the primary purpose of flood risk reduction.
Wind
Humidity
Completed in 2006, this earth dam stands at a height of 24.6 feet and stretches 480 feet in length, with a storage capacity of 81.9 acre-feet and a surface area of 3 acres. It is situated along the Grassy Creek, under the jurisdiction of the Rock Island District.
Despite its low hazard potential and moderate risk assessment, the dam has not been rated for its condition or undergone recent inspections. It features an uncontrolled spillway with a width of 20 feet and outlet gates that are also uncontrolled. With no associated structures, the dam's operation falls under the responsibility of the local government. Water resource and climate enthusiasts can appreciate the engineering marvel of Grassy Creek Watershed Dam G-40a, which plays a crucial role in managing flood risks in the region while supporting fire protection, stock, fish and wildlife ponds, and overall environmental conservation efforts.
Year Completed |
2006 |
Dam Length |
480 |
Dam Height |
24.6 |
River Or Stream |
GRASSY CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
24.6 |
Drainage Area |
89.6 |
Nid Storage |
81.9 |
Structural Height |
29 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
Wyaconda River Above Canton
|
13cfs |
South Fabius River Near Taylor
|
12cfs |
North River At Palmyra
|
21cfs |
Salt River Near Shelbina
|
30cfs |
Bear Creek Near Marcelline
|
5cfs |
Salt River At Hagers Grove
|
1cfs |