Pilot Rock Subwtrshd Sta 45+48 #2 Reservoir Report
Last Updated: December 14, 2025
Located in Cherokee, Iowa, the Pilot Rock Subwtrshd Sta 45+48 #2 is a local government-owned earth dam completed in 1963 by the USDA NRCS.
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Summary
This dam serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction for the area. With a dam height of 33 feet and a length of 470 feet, it has a storage capacity of 91 acre-feet and covers a surface area of 4 acres.
Managed by the Iowa DNR, this dam on the TR-Little Sioux River has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. While the last inspection was conducted in 1978, the dam is regulated, permitted, inspected, and enforced by the state agencies, ensuring its safety and functionality. With a moderate risk assessment score of 3, there are currently no emergency action plans in place for this structure, but it meets the necessary guidelines for risk management measures.
Despite its age, the Pilot Rock Subwtrshd Sta 45+48 #2 continues to play a crucial role in water resource management for the region, highlighting the importance of maintaining and monitoring infrastructure to mitigate potential risks and ensure the safety of communities and ecosystems downstream.
Year Completed |
1963 |
Dam Length |
470 |
Dam Height |
33 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.65 |
Nid Storage |
91 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Little Sioux River At Linn Grove
|
257cfs |
Floyd River At Alton
|
36cfs |
Ocheyedan River Near Spencer
|
59cfs |
North Raccoon River Near Sac City
|
312cfs |
Maple River At Mapleton
|
323cfs |
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.
Pilot Rock Subwtrshd Sta 45+48 #2