Dickman Subwatershed Site M-4 Reservoir Report
Last Updated: December 14, 2025
Dickman Subwatershed Site M-4, located in Woodbury County, Iowa, is a crucial resource managed by the local government and designed by the USDA NRCS.
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Summary
This earth dam, completed in 1973, serves multiple purposes including fire protection, stock watering, and small fish pond management. With a height of 34 feet and a length of 644 feet, the dam has a storage capacity of 59 acre-feet and covers a surface area of 2.8 acres.
The dam's primary function is flood risk reduction, with a drainage area of 0.82 square miles along the TR-Little Sioux River. Despite its low hazard potential, the dam is regulated by the Iowa DNR and undergoes state inspections and enforcement to ensure its structural integrity and compliance with safety standards. The risk assessment for this site is moderate, emphasizing the importance of ongoing monitoring and risk management measures to protect the surrounding community and environment from potential hazards and flooding events.
Overall, Dickman Subwatershed Site M-4 plays a vital role in water resource management and climate resilience efforts in the region. Its strategic location, design features, and multi-purpose functionality demonstrate a commitment to sustainable water management practices and the protection of downstream areas from flooding risks. As a key infrastructure asset, this site exemplifies the importance of proactive maintenance and monitoring to safeguard water resources and enhance community resilience in the face of changing climate conditions.
Year Completed |
1973 |
Dam Length |
644 |
Dam Height |
34 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Drainage Area |
0.82 |
Nid Storage |
59 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
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.
Dickman Subwatershed Site M-4