Washburn Lake Reservoir Report

Last Updated: December 5, 2025

Washburn Lake in Minnesota is a state-regulated reservoir with a low hazard potential and a moderate risk assessment.


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Summary

Built in 1958, this gravity dam stands at a height of 6 feet and has a storage capacity of 450 acre-feet. The reservoir covers an area of 50 acres and is primarily used for purposes other than flood control or water supply.

Located in Aitkin County, Washburn Lake is managed by the Minnesota Department of Natural Resources (MNDNR) and falls under the jurisdiction of the state regulatory agency. Despite its relatively small size, the reservoir plays a crucial role in the local ecosystem, providing a habitat for various aquatic species and serving as a recreational spot for fishing and boating enthusiasts. With a drainage area of 0.35 square miles and a maximum discharge capacity of 250 cubic feet per second, Washburn Lake contributes to the overall water management efforts in the region.

Although Washburn Lake has not been rated for its condition assessment, regular inspections are carried out every 8 years to ensure the safety and integrity of the dam structure. With its picturesque surroundings and moderate risk profile, Washburn Lake offers a peaceful retreat for water resource and climate enthusiasts seeking to explore the diverse landscapes of Minnesota's water infrastructure.

Year Completed

1958

Dam Length

35

Dam Height

6

River Or Stream

WILLOW RIVER-TR

Primary Dam Type

Gravity

Surface Area

50

Drainage Area

0.35

Nid Storage

450

Structural Height

10

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

10
       
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.