Wambold Reservoir Report

Last Updated: December 5, 2025

Wambold, also known as Eagle Spring Lake, is a gravity dam located in Waukesha, Wisconsin, with the primary purpose of recreation.


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Summary

Completed in 1836, this historic structure stands at a height of 12 feet and spans a length of 301 feet. With a normal storage capacity of 1127 acre-feet and a drainage area of 22 square miles, Wambold serves as a vital water resource for the surrounding community.

Managed by the Wisconsin Department of Natural Resources (WIDNR), Wambold has a state-regulated status, with regular inspections and enforcement to ensure its structural integrity. Despite being classified as having a significant hazard potential, the dam is currently in fair condition as of the last assessment in May 2020. In the event of an emergency, the dam has an Emergency Action Plan (EAP) in place to guide response efforts, although it was last revised in 2014.

Water resource and climate enthusiasts will appreciate the historical significance and environmental impact of Wambold, as well as the ongoing efforts to manage its risk and ensure public safety. Located along the Mukwonago River in EAGLEVILLE, Wisconsin, this dam not only provides recreational opportunities but also plays a critical role in water storage and management for the region. With its controlled spillway and very high risk assessment rating, Wambold remains a focal point for conservation and sustainable water resource practices in the area.

Years Modified

1898 - Other

Year Completed

1836

Dam Length

301

Dam Height

12

River Or Stream

MUKWONAGO R

Primary Dam Type

Gravity

Surface Area

311

Hydraulic Height

8

Drainage Area

22

Nid Storage

1540

Structural Height

12

Hazard Potential

Significant

Nid Height

12
       
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.