Lake Hallie Reservoir Report

Last Updated: December 13, 2025

Lake Hallie in Chippewa County, Wisconsin, is a picturesque reservoir primarily used for recreation, with a focus on fish and wildlife conservation.


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Summary

The earth dam, standing at a height of 23 feet and completed in 1908, creates a reservoir with a storage capacity of 650 acre-feet and a surface area of 83.7 acres. The dam is regulated by the Wisconsin Department of Natural Resources, ensuring that it meets state inspection, permitting, and enforcement standards.

The reservoir's controlled spillway, with a maximum discharge of 148 cubic feet per second, helps manage water levels during periods of high flow. Despite being classified as having a low hazard potential, a very high risk assessment ranking indicates the importance of proactive risk management measures. The dam's condition was deemed satisfactory during its last assessment in February 2019, with regular inspections scheduled every 10 years to ensure its continued safety and functionality.

Lake Hallie not only provides a tranquil setting for outdoor recreation but also serves as a vital habitat for local wildlife. As climate change continues to impact water resources, the conservation and maintenance of such bodies of water are essential to preserving the ecosystem's balance and ensuring sustainable water management practices for future generations.

Years Modified

1997 - Other

Year Completed

1908

Dam Length

500

Dam Height

23

River Or Stream

Lake Hallie Outlet

Primary Dam Type

Earth

Surface Area

83.7

Hydraulic Height

18

Drainage Area

1.4

Nid Storage

650

Structural Height

23

Hazard Potential

Low

Nid Height

23
       
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.