Wood Lake Reservoir Report

Last Updated: December 12, 2025

Wood Lake, located in Madelia, Minnesota, is a state-regulated recreational reservoir constructed in 1940 by WPA-C.


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Summary

The dam stands at 8 feet high with a hydraulic height of 1.5 feet, providing a storage capacity of 2000 acre-feet and covering a surface area of 508 acres. The reservoir is primarily used for recreational purposes and is situated along the WATONWAN RIVER N FK-TR, offering visitors a tranquil setting for boating, fishing, and other water-related activities.

Despite its low hazard potential and satisfactory condition assessment, Wood Lake is subject to regular state inspection, permitting, and enforcement by the Minnesota Department of Natural Resources (MNDNR EWR). The dam, classified as "Other" in type, features a buttress core structure and serves as a vital resource for the surrounding community. While the reservoir's primary purpose is recreation, it also plays a role in water resource management and conservation efforts within the Watonwan County area.

With its rich history, scenic beauty, and essential role in water management, Wood Lake stands as a testament to the importance of sustainable reservoir development and maintenance. As a beloved destination for outdoor enthusiasts and climate advocates alike, the reservoir continues to provide a vital source of recreation and ecological support for the local ecosystem.

Year Completed

1940

Dam Height

8

River Or Stream

WATONWAN RIVER N FK-TR

Primary Dam Type

Other

Surface Area

508

Hydraulic Height

1.5

Drainage Area

13.9

Nid Storage

2000

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

8
       
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.
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