Gibson South - Dredge Spoil Disposal Reservoir Report

Last Updated: December 13, 2025

Gibson South - Dredge Spoil Disposal is a private dam located in Panora, Iowa, along the Tr- Middle Raccoon River.


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Summary

Built in 1999, this Earth dam stands at 95 feet tall and stretches 1170 feet in length, providing storage for 848 acre-feet of water. The dam's primary purpose is listed as "Other," with a significant hazard potential and satisfactory condition assessment.

Managed by the Iowa Department of Natural Resources, Gibson South - Dredge Spoil Disposal is subject to state regulation, permitting, inspection, and enforcement. The dam has a drainage area of 0.19 square miles and a surface area of 20.8 acres, serving as a crucial structure for water resource management in the region. With a moderate risk assessment score of 3, the dam's risk management measures and potential hazards are closely monitored.

Overall, Gibson South - Dredge Spoil Disposal plays a vital role in water resource infrastructure in Guthrie County, Iowa, contributing to flood control and water storage along the Middle Raccoon River. As an Earth dam with soil foundations, it signifies the importance of sustainable water management practices and highlights the collaboration between private owners, regulatory agencies, and engineering firms like MHF Engineering in ensuring the safety and efficiency of water structures in the area.

Year Completed

1999

Dam Length

1170

Dam Height

95

River Or Stream

Tr- Middle Raccoon River

Primary Dam Type

Earth

Surface Area

20.8

Drainage Area

0.19

Nid Storage

848

Hazard Potential

Significant

Foundations

Soil

Nid Height

95
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.