Island Lake Reservoir Report
Nearby: Island Lake North Dike Fish Lake
Last Updated: December 5, 2025
Island Lake, located in Cloquet, Minnesota, is a significant hydroelectric and recreational resource along the Cloquet River.
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Summary
Constructed in 1915, the dam stands at a height of 57 feet and has a hydraulic height of 36 feet, with a storage capacity of 177,000 acre-feet. The dam's primary purpose is hydroelectric power generation, but it also serves as a recreational area, offering opportunities for outdoor activities in its vast surface area of 10,800 acres.
Managed by the Federal Energy Regulatory Commission, Island Lake Dam has a controlled spillway with a width of 40 feet and a high hazard potential, necessitating regular inspections to ensure its safety. The dam's structure, consisting of concrete, earth, and gravity elements, spans 880 feet and has a maximum discharge capacity of 7,445 cubic feet per second. With its close proximity to the city and its critical role in water resource management, Island Lake Dam remains a vital asset for the region, providing both energy production and recreational enjoyment for visitors.
Despite its age, Island Lake Dam continues to be a key player in the region's water resource infrastructure, with its high risk potential requiring ongoing risk management measures. The dam's association with the Cloquet River and its significant storage capacity make it a crucial component of the local ecosystem and water management system. As a focal point for both hydroelectric power generation and recreational activities, Island Lake Dam stands as a testament to the importance of sustainable water resource management and climate resilience in the face of evolving environmental challenges.
Year Completed |
1915 |
Dam Length |
880 |
Dam Height |
57 |
River Or Stream |
Cloquet River |
Surface Area |
10800 |
Hydraulic Height |
36 |
Drainage Area |
531 |
Nid Storage |
177000 |
Structural Height |
57 |
Outlet Gates |
Slide (sluice gate) - 5, Vertical Lift - 5 |
Hazard Potential |
High |
Nid Height |
57 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
White Pines Camp Stie
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Bald Eagle Camp site
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Lone Tree
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Heron Pond
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Island Lake