Lake Redstone Reservoir Report

Last Updated: December 5, 2025

Lake Redstone, located in Reedsburg, Sauk County, Wisconsin, is a gravity dam completed in 1967 primarily for recreational purposes.


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Summary

With a dam height of 50 feet and a storage capacity of 15,200 acre-feet, the lake covers an area of 612 acres and is fed by Big Creek. The dam has a controlled spillway with a width of 27 feet, and a maximum discharge capacity of 3,800 cubic feet per second.

Despite being classified as having a high hazard potential and fair condition assessment, Lake Redstone remains a popular destination for water and climate enthusiasts. The dam is under state regulation and inspection by the Wisconsin Department of Natural Resources, ensuring that safety measures are upheld. With its picturesque surroundings and ample recreational opportunities, including boating and fishing, Lake Redstone continues to attract visitors seeking a tranquil escape in the heart of Wisconsin's natural beauty.

While the risk assessment for Lake Redstone indicates a very high risk level, the local government owner ensures that emergency action plans are in place to mitigate any potential hazards. The dam's location on Big Creek provides a vital source of water for the area, making it a crucial resource for both residents and wildlife. As climate change impacts water resources, Lake Redstone stands as a testament to the importance of sustainable management and conservation practices for future generations to enjoy.

Year Completed

1967

Dam Length

600

Dam Height

50

River Or Stream

Big Creek

Primary Dam Type

Gravity

Surface Area

612

Hydraulic Height

37

Drainage Area

29.9

Nid Storage

15200

Structural Height

50

Hazard Potential

High

Nid Height

50
       
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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Area Campgrounds