Gresham Reservoir Report

Last Updated: December 6, 2025

Gresham, located in Shawano County, Wisconsin, is a hydroelectric dam with a primary purpose of generating electricity.


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Summary

Built in 1883, this gravity dam stands at a height of 44 feet and has a hydraulic height of 38 feet. With a storage capacity of 1,200 acre-feet and a maximum discharge of 1,672 cubic feet per second, Gresham plays a significant role in managing the Red River's flow and providing water for various purposes.

Despite its age, Gresham is considered to have a low hazard potential and has not been rated for its condition assessment. The dam's risk assessment is categorized as very high, emphasizing the need for effective risk management measures. While the dam does not fall under the jurisdiction of the US Army Corps of Engineers, it is regulated by the state and requires permits for operation. With its historical significance and importance in water resource management, Gresham serves as a vital infrastructure for the local community and beyond.

In addition to its hydroelectric function, Gresham also provides recreational opportunities for visitors. The dam's controlled spillway and associated structures make it a popular destination for outdoor enthusiasts seeking both water-based activities and scenic views. With its rich history, diverse purposes, and strategic location along the Red River, Gresham stands as a testament to the ingenuity of water resource management in Wisconsin.

Years Modified

1964 - Other

Year Completed

1883

Dam Length

309

Dam Height

44

River Or Stream

RED

Primary Dam Type

Gravity

Surface Area

188

Hydraulic Height

38

Drainage Area

147

Nid Storage

1200

Structural Height

44

Hazard Potential

Low

Nid Height

44
       
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.