Halverson Reservoir Report

Last Updated: December 5, 2025

Halverson, also known as Gov.


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Summary

Dodge State Park, is a state-owned dam located in Iowa, Wisconsin. This recreational dam on TR-Twin Valley Lake serves as a popular destination for water resource and climate enthusiasts, offering a surface area of 10 acres and a maximum storage capacity of 125 acre-feet. With a hydraulic height of 26 feet and a structural height of 37 feet, Halverson stands at a height of 37 feet and spans a length of 450 feet.

Despite its low hazard potential, Halverson's condition assessment is marked as unsatisfactory, with the last inspection date recorded in November 2013. The dam is regulated by the Wisconsin Department of Natural Resources (WIDNR), with state permitting, inspection, and enforcement in place to ensure its safety and compliance. While the dam's emergency action plan status and risk management measures are not currently specified, its location in COX HOLLOW DAM NO. 2 under the jurisdiction of the St. Paul District suggests ongoing efforts to mitigate potential risks and ensure public safety.

For water resource and climate enthusiasts visiting Halverson, its scenic setting within Gov. Dodge State Park offers opportunities for recreation and exploration. As one of Wisconsin's state-owned dams, Halverson provides a tranquil escape for outdoor activities, while also highlighting the importance of maintaining and monitoring dam infrastructure to safeguard against potential risks and ensure the continued enjoyment of this natural resource for years to come. With a focus on safety and regulatory compliance, Halverson serves as a reminder of the delicate balance between human recreation and environmental stewardship in the management of water resources.

Dam Length

450

Dam Height

37

River Or Stream

TR-TWIN VALLEY LAKE

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

26

Drainage Area

0.8

Nid Storage

125

Structural Height

37

Hazard Potential

Low

Nid Height

37
       
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.