Langlade County Flowage Reservoir Report
Last Updated: December 6, 2025
Langlade County Flowage, also known as Section 27 Dike, is a state-owned structure located in Langlade County, Wisconsin.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 1974, this earth dam stands at a height of 9 feet and serves the primary purpose of flood risk reduction. With a normal storage capacity of 70 acre-feet and a maximum storage of 90 acre-feet, this flowage area covers 6 acres and has a drainage area of 1 square mile, offering essential protection against potential flooding events in the region.
Managed by the Wisconsin Department of Natural Resources (WIDNR), Langlade County Flowage is regulated, permitted, inspected, and enforced by the state agency to ensure its structural integrity and functionality. The dam's hazard potential is classified as low, with a fair condition assessment as of May 2020. Despite this, the risk assessment for the area is deemed very high, emphasizing the critical importance of ongoing monitoring and maintenance to mitigate potential risks and ensure the safety of nearby communities.
In addition to flood risk reduction, Langlade County Flowage also provides recreational opportunities for visitors and residents. With a controlled spillway and a maximum discharge capacity of 45 cubic feet per second, this structure plays a vital role in water resource management and climate resilience efforts in the region. As climate change continues to impact water resources, the proper maintenance and operation of Langlade County Flowage are essential for safeguarding the local ecosystem and community from the increasing threat of flooding events.
Year Completed |
1974 |
Dam Length |
400 |
Dam Height |
9 |
River Or Stream |
TR TRAPPE RIVER |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
7 |
Drainage Area |
1 |
Nid Storage |
90 |
Structural Height |
9 |
Hazard Potential |
Low |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Prairie River Near Merrill
|
104cfs |
Wisconsin River At Merrill
|
1490cfs |
Eau Claire River At Kelly
|
280cfs |
Wisconsin River At Rothschild
|
2280cfs |
Rib River At Rib Falls
|
60cfs |
Red River At Morgan Road Near Morgan
|
145cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Langlade County Flowage