Lake Koronis Reservoir Report

Last Updated: December 13, 2025

Lake Koronis in Minnesota is a state-regulated water resource nestled in Meeker County, offering a serene setting for outdoor enthusiasts.


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Summary

With a primary purpose of recreation, this concrete dam constructed in 1989 stands at a height of 9 feet, providing a storage capacity of 90,000 acre-feet. The lake covers a surface area of 3034 acres with a drainage area of 307 acres, making it a vital water source in the region.

Managed by the Minnesota Department of Natural Resources, Lake Koronis boasts a low hazard potential and satisfactory condition assessment. The dam's inspection frequency is every 8 years, with the last assessment conducted in October 2017. The lake's recreational value is complemented by its scenic surroundings and proximity to the Crow River, attracting visitors seeking water-based activities and relaxation. Climate and water resource enthusiasts can appreciate Lake Koronis for its ecological significance and contribution to the local ecosystem.

As a prominent feature in the St. Paul District maintained by the state, Lake Koronis serves as a recreational haven while also playing a crucial role in water management and conservation efforts. With its tranquil waters and abundant natural beauty, this reservoir showcases the harmonious balance between human recreation and environmental preservation, making it a must-visit destination for those passionate about water resources and climate sustainability.

Year Completed

1989

Dam Height

9

River Or Stream

CROW RIVER

Surface Area

3034

Drainage Area

307

Nid Storage

90000

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

9
       
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.