Pot Flowage Reservoir Report

Last Updated: December 6, 2025

Pot Flowage, also known as Langlade County Flowage, is a state-owned water resource located in Glandon, Langlade County, Wisconsin.


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Summary

Managed by the Wisconsin Department of Natural Resources (WIDNR), this earth dam structure was completed in 1974 for the primary purpose of flood risk reduction along the TR Trappe River. With a dam height of 8 feet and a storage capacity of 180 acre-feet, Pot Flowage covers an area of 10 acres and serves as a recreational spot in addition to its flood control functions.

Despite being classified as having low hazard potential, Pot Flowage is considered to have a very high risk level due to its condition assessment of 'Fair'. The dam's last inspection in May 2020 revealed this rating, prompting the need for regular maintenance and risk management measures to ensure the safety and integrity of the structure. With a controlled spillway type and a maximum discharge of 38 cubic feet per second, Pot Flowage plays a crucial role in mitigating flood risks in the area while offering recreational opportunities for water and climate enthusiasts to enjoy.

Year Completed

1974

Dam Length

950

Dam Height

8

River Or Stream

TR TRAPPE RIVER

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

7

Drainage Area

1.5

Nid Storage

180

Structural Height

8

Hazard Potential

Low

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.