Glen Hills 1 Reservoir Report

Last Updated: December 13, 2025

Located in St.


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Summary

Croix, Wisconsin, Glen Hills 1 is a vital structure designed by the USDA NRCS to manage flood risk and protect the surrounding environment. Completed in 1966, this earth dam stands at a height of 30 feet and spans 660 feet in length, with a storage capacity of 115 acre-feet. The dam serves multiple purposes, including debris control, flood risk reduction, and recreation, making it a key asset for the community.

The dam, which is regulated and inspected by the Wisconsin Department of Natural Resources, has a low hazard potential and is currently in fair condition. With a drainage area of 1.2 square miles and a maximum discharge of 73 cubic feet per second, Glen Hills 1 plays a crucial role in managing water levels and protecting the surrounding area from potential flooding. Despite being modified in 1996, the dam continues to meet guidelines and provide moderate risk management measures.

In the event of an emergency, the dam's emergency action plan (EAP) ensures that proper protocols are in place to safeguard the community. With a focus on risk assessment and management, Glen Hills 1 remains a valuable resource for water resource and climate enthusiasts, showcasing the importance of sustainable infrastructure in maintaining a resilient environment.

Years Modified

1996 - Other

Year Completed

1966

Dam Length

660

Dam Height

30

River Or Stream

Tributary to Power Line Creek

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

19

Drainage Area

1.2

Nid Storage

115

Structural Height

30

Hazard Potential

Low

Nid Height

30
       
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.