Bad Axe 11 Reservoir Report

Last Updated: December 5, 2025

Bad Axe 11, also known as Duck Egg, is a vital flood risk reduction structure located in Newton, Vernon County, Wisconsin.


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Summary

Constructed in 1987 by the USDA NRCS, this earth dam stands at a height of 70 feet and spans a length of 1100 feet. With a storage capacity of 4350 acre-feet and the ability to handle a maximum discharge of 14830 cubic feet per second, Bad Axe 11 plays a crucial role in managing water flow in the Springville Branch of the Bad Axe River.

Managed by the WIDNR and subject to state jurisdiction, Bad Axe 11 has been assessed to have a low hazard potential and satisfactory condition. The dam's uncontrolled spillway, with a width of 104 feet, helps regulate water levels during periods of high flow. Despite its low risk, the structure is subject to regular inspections every 10 years to ensure its continued effectiveness in flood risk reduction. With its location in a moderate risk area, Bad Axe 11 serves as a key component of the region's water resource management infrastructure.

Representing a collaboration between local government agencies and the USDA NRCS, Bad Axe 11 exemplifies the importance of strategic dam construction in protecting communities from the impacts of extreme weather events and climate change. Its presence in the St. Paul District underscores the interconnected nature of water resource management and the need for proactive measures to mitigate flood risks. For water resource and climate enthusiasts, Bad Axe 11 stands as a notable example of effective infrastructure design and management in response to evolving environmental challenges.

Year Completed

1987

Dam Length

1100

Dam Height

70

River Or Stream

SPRINGVILLE BR-BAD AXE R

Primary Dam Type

Earth

Drainage Area

21

Nid Storage

4350

Structural Height

70

Hazard Potential

Low

Nid Height

70
       
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.