Held Watershed Site A-1 in Plymouth, Iowa, is a vital water resource managed by the local government and regulated by the Iowa Department of Natural Resources.
Wind
Humidity
This earth dam, designed by the USDA NRCS in 1965, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 54 feet and a length of 694 feet, the dam has a storage capacity of 120 acre-feet and covers a surface area of 6 acres.
Situated along the TR-Floyd River, Held Watershed Site A-1 plays a crucial role in water management and conservation efforts in the region. Despite its low hazard potential and moderate risk assessment, the dam's condition has not been rated, highlighting the need for regular inspections and maintenance. With the dam meeting state permitting and inspection requirements, it remains a key infrastructure for ensuring water security and flood control in Sioux City and the surrounding areas.
Overall, Held Watershed Site A-1 is a significant water resource with a long history of serving the community for various purposes. As water resource and climate enthusiasts, it is important to monitor and support the maintenance of such vital infrastructure to ensure sustainable water management practices and safeguard against potential risks and hazards in the future.
Year Completed |
1965 |
Dam Length |
694 |
Dam Height |
54 |
River Or Stream |
TR-FLOYD RIVER |
Primary Dam Type |
Earth |
Surface Area |
6 |
Drainage Area |
0.67 |
Nid Storage |
120 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
54 |
Floyd River At James
|
187cfs |
Perry Creek Near Milnerville
|
25cfs |
Missouri River At Sioux City
|
15100cfs |
Big Sioux River At Akron
|
816cfs |
Omaha Cr At Homer
|
45cfs |
Little Sioux River At Correctionville
|
327cfs |