Island Park Dike Reservoir Report

Last Updated: December 21, 2025

Island Park Dike, located in Fremont, Idaho, is a federally owned structure managed by the Bureau of Reclamation.


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Summary

Built in 1937, this earth dam stands at a height of 12 feet and spans a length of 7870 feet, with a maximum storage capacity of 169,646 acre-feet. The dam serves the primary purpose of flood control and is regulated by the Bureau of Reclamation to ensure its safe operation and maintenance.

This dike plays a crucial role in protecting the surrounding area from potential flooding events, with a high hazard potential due to its location and storage capacity. Despite its age, the condition assessment of Island Park Dike is currently not available, highlighting the need for ongoing monitoring and maintenance to mitigate risks and ensure its effectiveness in safeguarding the community. The dike also has an Emergency Action Plan in place, although it may require updates to meet current guidelines and address potential risks.

With the potential for high-risk situations and a very high risk assessment rating, Island Park Dike remains a key infrastructure in the region's water resource management and climate resilience efforts. Its strategic design, federal ownership, and regulatory oversight by the Bureau of Reclamation underscore the importance of this structure in safeguarding the local community and environment from the impacts of extreme weather events and flooding.

Year Completed

1937

Dam Length

7870

Dam Height

12

Primary Dam Type

Earth

Nid Storage

169646

Structural Height

12

Hazard Potential

High

Foundations

Rock

Nid Height

12
       
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.