Wenger Subwatershed #M Sta 25+50 Reservoir Report
Last Updated: December 14, 2025
Wenger Subwatershed #M Sta 25+50 is a dam located in Mapleton, Iowa, designed by USDA NRCS and completed in 1965.
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Summary
This earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 32 feet and a length of 534 feet, this dam has a storage capacity of 78 acre-feet and covers a surface area of 2.8 acres. It is regulated by the Iowa Department of Natural Resources and is considered to have a low hazard potential.
Situated on TR-REYNOLDS CREEK, this dam plays a crucial role in managing water resources in Woodbury County, Iowa. Despite its moderate risk rating, Wenger Subwatershed #M Sta 25+50 has not been assigned a Dam Safety Action Classification and its condition assessment is not rated. Emergency preparedness measures such as an Emergency Action Plan (EAP) have not been reported, and inundation maps are yet to be prepared. However, the dam has undergone state inspection, permitting, and enforcement, ensuring its compliance with regulatory standards.
Owned and maintained by the local government, Wenger Subwatershed #M Sta 25+50 contributes to the overall water management system in the area. As a key structure for flood risk reduction and water storage, this dam provides valuable protection to the surrounding communities. Climate and water resource enthusiasts will find interest in the design, construction, and regulatory aspects of this dam, as well as its role in maintaining a sustainable water supply in the region.
Year Completed |
1965 |
Dam Length |
534 |
Dam Height |
32 |
River Or Stream |
TR-REYNOLDS CREEK |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Drainage Area |
0.37 |
Nid Storage |
78 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
14900cfs |
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.
Wenger Subwatershed #M Sta 25+50