Fawn Lake Reservoir Report

Last Updated: December 5, 2025

Fawn Lake, also known as Horner Lake, is a man-made reservoir located in Adams, Wisconsin.


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Summary

Managed by the local government, this picturesque lake serves primarily for recreational purposes. The dam, built in 1972, stands at a height of 19 feet and has a hydraulic height of 14 feet, with a storage capacity of 190 acre-feet.

Situated on Trout Creek, Fawn Lake covers a surface area of 19 acres and has a drainage area of 2.2 square miles. The dam has a controlled spillway and a maximum discharge capacity of 680 cubic feet per second. Despite being classified as having a high hazard potential, the dam's condition is assessed as satisfactory, with regular inspections carried out every two years to ensure its safety and functionality.

With its tranquil waters and scenic surroundings, Fawn Lake provides a recreational haven for water resource and climate enthusiasts in the region. Its importance as a local resource is underscored by state regulation, permitting, and enforcement to ensure the safety and sustainability of this cherished recreational area.

Year Completed

1972

Dam Length

1000

Dam Height

19

River Or Stream

TROUT CREEK

Primary Dam Type

Earth

Surface Area

19

Hydraulic Height

14

Drainage Area

2.2

Nid Storage

190

Structural Height

19

Hazard Potential

High

Nid Height

19
       
Seasonal Comparison

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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.