The Potacocawa Watershed Structure Y-31a-13 Dam, also known as McDonald Dam, is a vital flood risk reduction infrastructure located in Carroll, Mississippi.
Wind
Humidity
Built in 1966 by the USDA NRCS, this earth-type dam stands at a height of 39 feet and has a maximum storage capacity of 3353 acre-feet. It is regulated and inspected by the Mississippi Department of Environmental Quality, ensuring its safety and efficiency in managing the flow of Purnell Creek.
With a low hazard potential and a moderate risk assessment score, the Potacocawa Watershed Dam plays a crucial role in protecting the surrounding area from potential flooding events. Its uncontrolled spillway and outlet gates are designed to handle excess water flow, while its buttress core type and soil foundation provide stability and reliability. As a key structure in the Vicksburg District, this dam serves as a testament to the collaborative efforts of local government and federal agencies in safeguarding water resources and mitigating climate-related risks in Mississippi.
Year Completed |
1966 |
Dam Height |
39 |
River Or Stream |
PURNELL CREEK |
Primary Dam Type |
Earth |
Surface Area |
82.3 |
Drainage Area |
8.57 |
Nid Storage |
3353 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Batupan Bogue At Grenada
|
134cfs |
Yalobusha River At Grenada
|
3080cfs |
Tallahatchie River At Money
|
6080cfs |
Abiaca Creek At Cruger
|
44cfs |
Big Black River At West
|
223cfs |
Otoucalofa Creek Canal Nr Water Valley
|
25cfs |