Southridge Road Detention Basin
Southridge Road Detention Basin is an earth dam located in Marshall County, Iowa, built in 1996. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Southridge Road Detention Basin
The primary purpose of Southridge Road Detention Basin is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by City Of Marshalltown (local government). It impounds the Anson Creek near Marshalltown.
The dam stands 18 feet tall and stretches 800 feet across, has a maximum storage capacity of 101 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1996, the structure is 30 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/03/2023.
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Location
| State | Iowa |
| County | Marshall |
| Nearest City | Marshalltown |
| River/Stream | Anson Creek |
| Coordinates | 42.01790, -92.89970 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 800 ft |
| Year Completed | 1996 (30 years old) |
Storage & Hydraulics
| NID Storage | 101 acre-ft |
| Max Storage | 101 acre-ft |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | City of Marshalltown |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/03/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04145 |
| Federal ID | IA04145 |
| More Info | State Dam Safety Program |