Keller Reservoir Report

Last Updated: December 6, 2025

Located in Waupaca, Wisconsin, the Keller dam is a recreational structure on the South Branch Pigeon River.


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Summary

Built in 1938, the Earth type dam stands at 22.3 feet high and spans 140 feet in length. It has a storage capacity of 400 acre-feet and a normal storage level of 90 acre-feet, serving as a popular spot for outdoor activities in the region.

Managed by the local government, Keller dam is regulated by the Wisconsin Department of Natural Resources, with regular inspections and enforcement measures in place to ensure its safety and functionality. Despite being classified as low hazard potential and in fair condition, a moderate risk assessment indicates the need for ongoing risk management measures. The dam's spillway, with a width of 78 feet, is uncontrolled, allowing for a maximum discharge of 1150 cubic feet per second.

With its historical significance and role in providing recreational opportunities, Keller dam remains a valuable asset in the water resource management of the area. Enthusiasts interested in water infrastructure and climate resilience will find the structure's design, purpose, and maintenance details intriguing, highlighting the intersection of human use and natural conservation efforts in the region.

Years Modified

1939 - Other

Year Completed

1938

Dam Length

140

Dam Height

22.3

River Or Stream

SOUTH BRANCH PIGEON RIVER

Primary Dam Type

Earth

Surface Area

18

Hydraulic Height

21.4

Drainage Area

31

Nid Storage

400

Structural Height

22.3

Hazard Potential

Low

Nid Height

22
       
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.