Lucas Lake Reservoir Report

Last Updated: December 5, 2025

Lucas Lake, located in Washington County, Wisconsin, is a picturesque reservoir on Silver Creek with a primary purpose of recreation.


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Summary

The dam, completed in 1923, is classified as a gravity dam with a height of 8 feet and a length of 150 feet. The lake has a maximum storage capacity of 630 acre-feet and a normal storage capacity of 400 acre-feet, providing ample water for various recreational activities.

Despite its age, Lucas Lake's dam is in fair condition with a high hazard potential, indicating the need for regular inspections and maintenance to ensure its safety. The lake covers a surface area of 78 acres and has a drainage area of 3 square miles. With a controlled spillway type and a maximum discharge of 217 cubic feet per second, the dam is equipped to manage excess water flow effectively. Additionally, the risk assessment for Lucas Lake rates it as very high, highlighting the importance of implementing proper risk management measures to protect the surrounding community and environment.

In the care of a private owner, Lucas Lake is a popular destination for water resource and climate enthusiasts seeking outdoor recreational opportunities in a tranquil natural setting. With its historical significance, impressive engineering design, and critical role in water management, Lucas Lake remains a valuable asset in Washington County's landscape.

Year Completed

1923

Dam Length

150

Dam Height

8

River Or Stream

SILVER CREEK

Primary Dam Type

Gravity

Surface Area

78

Hydraulic Height

5

Drainage Area

3

Nid Storage

630

Structural Height

8

Hazard Potential

High

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.