Perion Subwatershed Site A-7500 Reservoir Report
Last Updated: December 14, 2025
Perion Subwatershed Site A-7500 in Iowa is a local government-owned earth dam constructed in 1949 by the USDA NRCS to serve multiple purposes including fire protection, stock, and small fish pond, as well as flood risk reduction in the region.
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Summary
Located in Ida County, the dam has a maximum storage capacity of 59 acre-feet and a normal storage capacity of 20 acre-feet, with a surface area of 5 acres and a drainage area of 0.29 square miles. The dam, built on the TR-Maple River, stands at a height of 23 feet and is regulated by the Iowa DNR.
Despite being rated as low hazard potential and not yet assessed for condition, the dam's risk assessment is moderate (3), prompting the need for risk management measures to ensure its continued safety and functionality. With uncontrolled spillway type and no outlet gates, the dam's emergency action plan (EAP) status, inundation maps, and risk management measures remain undefined. As a part of the Rock Island District, the site's risk level and need for assessment underscore the importance of proactive monitoring and maintenance to safeguard water resources and enhance climate resilience in the area.
Year Completed |
1949 |
Dam Height |
23 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.29 |
Nid Storage |
59 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
North Raccoon River Near Sac City
|
312cfs |
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Little Sioux River At Linn Grove
|
257cfs |
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.
Perion Subwatershed Site A-7500