Smokey Hollow Subwatershed Site 4, located in Smithland, Iowa, is a local government-owned flood risk reduction structure designed by the USDA NRCS and regulated by the Iowa DNR.
Wind
Humidity
This earth dam, completed in 1985, stands at 64 feet high and spans a length of 620 feet, providing a storage capacity of 523 acre-feet. Situated along the Smokey Hollow River, this structure serves the primary purpose of flood risk reduction for the surrounding area, with a surface area of 4.7 acres and a drainage area of 0.54 square miles.
Despite its high hazard potential, Smokey Hollow Subwatershed Site 4 is currently assessed to be in fair condition, with regular inspections conducted every two years. The dam's spillway type is uncontrolled, with a width of 3 feet, and it has a moderate risk rating of 3. While there are no associated structures or locks, this site plays a crucial role in managing water resources and mitigating flood risks in the Woodbury County area. Water resource and climate enthusiasts will find this site to be a key component in the local watershed management system, ensuring the safety and well-being of the community.
Year Completed |
1985 |
Dam Length |
620 |
Dam Height |
64 |
River Or Stream |
SMOKEY HOLLOW |
Primary Dam Type |
Earth |
Surface Area |
4.7 |
Drainage Area |
0.54 |
Nid Storage |
523 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
64 |
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
15500cfs |