Pilot Rock Subwtrshd Sta 30+40 #1-C Reservoir Report
Last Updated: December 14, 2025
Pilot Rock Subwatershed Station 30+40 #1-C is a locally owned earth dam located in Quimby, Iowa, designed by the USDA NRCS.
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Summary
Completed in 1963, this dam serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a height of 38 feet and a length of 259 feet, the dam has a storage capacity of 40 acre-feet and covers a surface area of 2 acres, draining a 0.2 square mile drainage area.
Managed by the Iowa Department of Natural Resources, the dam is regulated, permitted, inspected, and enforced by the state, ensuring its safety and functionality. Despite its low hazard potential and moderate risk assessment, the dam's condition is currently not rated, with the last inspection conducted in December 1960. While there are no outlet gates or locks, the spillway type is uncontrolled, with a spillway width of 0 feet. The dam's risk management measures and emergency action plan status are currently unspecified.
Water resource and climate enthusiasts interested in the sustainable management of dams and water infrastructure in Iowa may find the Pilot Rock Subwatershed Station 30+40 #1-C an intriguing case study. With its unique design and multi-purpose functionality, this dam exemplifies the importance of balancing water resource utilization for agricultural, ecological, and community needs while ensuring safety and regulatory compliance in the face of changing climate conditions.
Year Completed |
1963 |
Dam Length |
259 |
Dam Height |
38 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.2 |
Nid Storage |
40 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
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 30+40 #1-C