Peshtigo Reservoir Report

Last Updated: December 5, 2025

Peshtigo is a captivating hydroelectric dam located on the Peshtigo River in Wisconsin.


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Summary

Built in 1907 by Mead and Seastone, this gravity dam stands at a height of 19 feet and has a hydraulic height of 13 feet. With a normal storage capacity of 1000 acre-feet and a maximum discharge of 11500 cubic feet per second, Peshtigo plays a crucial role in both hydroelectric power generation and recreational activities.

Managed by the Federal Energy Regulatory Commission, Peshtigo has a low hazard potential and a very high risk assessment rating. The dam features a controlled spillway with a width of 105 feet and is equipped with Tainter (radial) gates for water release. Despite not having a recent condition assessment available, the dam's emergency action plan was last revised in August 2020, demonstrating a commitment to safety and preparedness in case of emergencies.

With its historical significance and important role in water resource management, Peshtigo is a fascinating site for water resource and climate enthusiasts. Its location on the Peshtigo River offers a unique opportunity to study the impact of dams on the surrounding ecosystem and the benefits they provide in terms of renewable energy production and water supply. As a well-maintained and regulated structure, Peshtigo sets a high standard for dam safety and operation, showcasing the importance of responsible management of water resources in the face of climate change challenges.

Year Completed

1907

Dam Length

358

Dam Height

19

River Or Stream

Peshtigo River

Primary Dam Type

Gravity

Surface Area

460

Hydraulic Height

13

Drainage Area

1086

Nid Storage

2000

Outlet Gates

Tainter (radial) - 6

Hazard Potential

Low

Foundations

Soil

Nid Height

19
       
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.