Cord Subwatershed M-5571 Reservoir Report
Last Updated: December 13, 2025
Located in Woodbury County, Iowa, the Cord Subwatershed M-5571 is a vital water resource managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
This earth dam structure, designed by USDA NRCS in 1957, serves multiple purposes including fire protection, stock watering, and flood risk reduction. With a height of 36 feet and a length of 450 feet, this dam has a normal storage capacity of 54 acre-feet and a maximum storage of 119 acre-feet.
The dam impounds TR-MILLER CREEK, providing a surface area of 4.2 acres and draining a watershed area of 0.41 square miles. While the hazard potential is deemed low, the risk assessment indicates a moderate level. The last inspection conducted in 1977 found the condition to be not rated, highlighting the need for updated assessments and emergency action plans. Despite its age, the Cord Subwatershed M-5571 remains a crucial infrastructure for water management in the region, warranting ongoing monitoring and maintenance to ensure its effectiveness in safeguarding local communities and ecosystems from potential risks and emergencies.
Year Completed |
1957 |
Dam Length |
450 |
Dam Height |
36 |
River Or Stream |
TR-MILLER CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.2 |
Drainage Area |
0.41 |
Nid Storage |
119 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
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
|
15500cfs |
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.
Cord Subwatershed M-5571