Uihlein Reservoir Report

Last Updated: December 5, 2025

Uihlein, also known as Maple Spring and Ryan, is a privately owned dam located in Ashland, Wisconsin.


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Summary

Built in 1974, this earth-type dam stands at 18 feet high and serves primarily for recreational purposes. With a normal storage capacity of 49 acre-feet and a maximum storage of 103 acre-feet, Uihlein is situated on TR Trout Brook within the St. Paul District.

Despite being categorized as low hazard potential and fair condition assessment, Uihlein is subject to state regulation, inspection, and enforcement by the Wisconsin Department of Natural Resources. The dam's moderate risk assessment indicates a potential for issues that may require management measures in the future. With an uncontrolled spillway and a drainage area of 0.2 square miles, Uihlein offers a glimpse into the delicate balance between water resource management and recreational use in the region.

Enthusiasts of water resources and climate will find Uihlein to be an intriguing case study, showcasing the intersection of recreational infrastructure, environmental regulations, and risk assessment. As a privately owned structure, Uihlein presents unique challenges and opportunities for sustainable management practices. Its location in Ashland, Wisconsin, along with its historical significance and potential impact on the surrounding ecosystem, make Uihlein a focal point for those interested in the intricate relationship between water resources and human activities in the region.

Year Completed

1974

Dam Length

280

Dam Height

18

River Or Stream

TR TROUT BROOK

Primary Dam Type

Earth

Surface Area

9

Hydraulic Height

13

Drainage Area

0.2

Nid Storage

103

Structural Height

18

Hazard Potential

Low

Nid Height

18
       
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.