Arnold-Armstrong Subwtrshd Sta27+80 #26 Reservoir Report
Last Updated: December 15, 2025
The Arnold-Armstrong Subwtrshd Sta27+80 #26 is a dam located in Monona, Iowa, designed by the USDA NRCS and completed in 1961.
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Summary
It serves multiple purposes, including fire protection, stock, small fish pond, and flood risk reduction. The dam is classified as an earth dam with a height of 44 feet and a length of 440 feet, providing a storage capacity of 58 acre-feet.
Managed by the local government and regulated by the Iowa Department of Natural Resources, the dam is situated on the TR-MAPLE RIVER and has a low hazard potential. Despite being in low-risk conditions and not currently rated for its condition, the dam has a moderate risk assessment score of 3. With a drainage area of 0.37 square miles and a surface area of 3 acres, the dam plays a crucial role in water resource management in the area and contributes to the overall climate resilience of the region.
Year Completed |
1961 |
Dam Length |
440 |
Dam Height |
44 |
River Or Stream |
TR-MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.37 |
Nid Storage |
58 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
44 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
14800cfs |
Little Sioux River At Correctionville
|
327cfs |
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.
Arnold-Armstrong Subwtrshd Sta27+80 #26