S 2nd Street Stormwater Detention Basin Reservoir Report
Last Updated: December 15, 2025
The S 2nd Street Stormwater Detention Basin is a remarkable flood risk reduction structure located in Marshalltown, Iowa, along the Anson Creek.
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Summary
Designed by VEENSTRA & KIMM and completed in 1997, this earth dam stands at 11 feet tall and spans 1050 feet in length. With a storage capacity of 136 acre-feet, it serves a primary purpose of flood risk reduction, helping to mitigate potential flooding in the area.
Owned by the local government and regulated by the Iowa Department of Natural Resources, this detention basin plays a crucial role in managing stormwater and protecting the surrounding community from the impacts of heavy rainfall and potential flooding events. With a low hazard potential and a moderate risk assessment rating, the S 2nd Street Stormwater Detention Basin is a vital piece of infrastructure that helps to safeguard the residents of Marshalltown against the threat of water-related disasters.
Situated within the Detroit District of the US Army Corps of Engineers, this detention basin operates with uncontrolled spillways and is primarily constructed of soil foundations. While its condition assessment is currently not rated, ongoing inspections and maintenance ensure that the structure remains effective in its flood mitigation capabilities. Overall, the S 2nd Street Stormwater Detention Basin stands as a testament to the importance of proactive water resource management in combating the challenges posed by changing climate patterns and increasing precipitation events.
Year Completed |
1997 |
Dam Length |
1050 |
Dam Height |
11 |
River Or Stream |
ANSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.9 |
Drainage Area |
0.62 |
Nid Storage |
136 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Timber Creek Near Marshalltown
|
37cfs |
Iowa River At Marshalltown
|
1040cfs |
Richland Creek Near Haven
|
12cfs |
South Fork Iowa River Ne Of New Providence
|
79cfs |
Indian Creek Near Mingo
|
79cfs |
South Skunk River At Colfax
|
211cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Riverview Park - Marshalltown
|
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Timmons Grove County Park
|
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Grammer Grove Wildlife Area
|
S 2nd Street Stormwater Detention Basin