Peacock Reservoir Report

Last Updated: December 5, 2025

Peacock, also known as Fowler Lake, is a gravity dam located in Oconomowoc, Wisconsin, that serves primarily for recreational purposes.


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Summary

Completed in 1840, this historic dam stands at a height of 11 feet and has a storage capacity of 630 acre-feet. With a surface area of 78 acres and a drainage area of 88 acres, Peacock Dam plays a crucial role in managing water resources in the region.

Managed by the local government and regulated by the Wisconsin Department of Natural Resources, Peacock Dam has been deemed to have a significant hazard potential, although its condition is currently assessed as satisfactory. The dam has undergone modifications in 1938 and is subject to regular inspections to ensure its safety and structural integrity. Its controlled spillway, with a width of 90 feet, helps regulate the flow of the Oconomowoc River and prevent flooding in the surrounding area.

Despite its age, Peacock Dam continues to be a vital asset for water management and recreational activities in Waukesha County. Enthusiasts of water resources and climate will appreciate the historical significance and functional importance of this structure in sustaining the local ecosystem and providing opportunities for outdoor recreation.

Years Modified

1938 - Other

Year Completed

1840

Dam Length

150

Dam Height

11

River Or Stream

OCONOMOWOC

Primary Dam Type

Gravity

Surface Area

78

Hydraulic Height

7

Drainage Area

88

Nid Storage

630

Structural Height

11

Hazard Potential

Significant

Nid Height

11
       
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.