Glen Hills 3 Reservoir Report

Last Updated: December 6, 2025

Glen Hills 3 is a crucial flood risk reduction structure located in St.


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Summary

Croix, Wisconsin, along the Blue Creek. Constructed in 1970 by the USDA NRCS, this earth dam stands at a height of 29.5 feet and has a maximum storage capacity of 274 acre-feet. With a fair condition assessment and low hazard potential, Glen Hills 3 serves multiple purposes including debris control, flood risk reduction, and recreation for the local community.

Managed by the Wisconsin Department of Natural Resources, Glen Hills 3 is regulated, inspected, and enforced to ensure its safety and functionality. The dam features an uncontrolled spillway and has a moderate risk assessment rating. Despite being modified in 2002, the structure continues to provide essential protection to the surrounding area, with a drainage area of 2.4 square miles and a maximum discharge capacity of 727 cubic feet per second. With a history of serving the community for over 50 years, Glen Hills 3 remains a vital component in the region's water resource and climate management efforts.

Years Modified

2002 - Other

Year Completed

1970

Dam Length

860

Dam Height

29.5

River Or Stream

Blue Creek

Primary Dam Type

Earth

Surface Area

11

Hydraulic Height

16

Drainage Area

2.4

Nid Storage

274

Structural Height

29.5

Hazard Potential

Low

Nid Height

30
       
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.