Lake Carlos Reservoir Report

Last Updated: December 5, 2025

Lake Carlos, located in Carlos, Minnesota, is a picturesque reservoir on the Long Prairie River that offers a range of recreational activities for water resource and climate enthusiasts.


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Summary

Managed by the Minnesota Department of Natural Resources, this state-owned lake was completed in 1993 and has a primary purpose of recreation. With a surface area of 183 acres and a maximum storage capacity of 156,000 acre-feet, Lake Carlos provides ample space for boating, fishing, and other water-based activities.

The dam at Lake Carlos stands at a height of 3 feet with a structural height of 7.2 feet, serving as a vital structure for water management in the region. Despite its low hazard potential, the dam's condition is assessed as satisfactory, ensuring the safety and stability of the reservoir. The area surrounding Lake Carlos, with its scenic beauty and diverse wildlife, attracts visitors looking to immerse themselves in nature and enjoy a peaceful retreat. Whether it's hiking along the shores or birdwatching in the surrounding Douglas County, Lake Carlos offers a serene escape for those seeking to connect with the natural world.

Year Completed

1993

Dam Height

3

River Or Stream

LONG PRAIRIE RIVER

Primary Dam Type

Other

Surface Area

183

Drainage Area

247

Nid Storage

156000

Structural Height

7.2

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

7
       
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.