Gibson North - Dredge Spoil Containment Reservoir Report

Last Updated: December 13, 2025

Located in Lake Panorama, Iowa, the Gibson North Dredge Spoil Containment structure is a privately-owned earth dam designed by John Milligan of MHF Engineering.


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Summary

Completed in 2006, this dam stands at a height of 104 feet with a length of 2,270 feet, providing a storage capacity of 1,625 acre-feet for the Tr-Lake Panorama (Middle Raccoon River). The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its fair condition and significant hazard potential.

Despite its uncontrolled spillway type and moderate risk assessment, the Gibson North dam remains a crucial asset for water resource management in Guthrie County. With a drainage area of 1.83 square miles, this structure plays a vital role in flood control and environmental protection for the surrounding area. As climate change continues to impact water resources, the maintenance and upkeep of dams like Gibson North are essential for ensuring the safety and resilience of communities against potential disasters.

Year Completed

2006

Dam Length

2270

Dam Height

104

River Or Stream

Tr-Lake Panorama (Middle Raccoon River)

Primary Dam Type

Earth

Drainage Area

1.83

Nid Storage

1625

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

104
       
Seasonal Comparison

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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.