Turtle Valley Phase Iii Reservoir Report

Last Updated: December 5, 2025

Turtle Valley Phase III is a state-regulated dam located in Walworth, Wisconsin, along Sugar Creek.


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Summary

This Earth-type dam stands at a height of 12.5 feet with a maximum storage capacity of 319 acre-feet and a normal storage of 244 acre-feet. With a low hazard potential and a very high risk assessment rating, this dam is closely monitored by the Wisconsin Department of Natural Resources (WIDNR) through regular inspections and enforcement measures.

The dam features a controlled spillway and has a drainage area of 0.92 square miles, serving a significant purpose within the local water resource management system. Despite its age and unknown year of completion, Turtle Valley Phase III has not been rated for its current condition, emphasizing the need for ongoing risk management and emergency preparedness. With a designated emergency action plan (EAP) in place, the dam remains a critical structure for maintaining water levels and protecting downstream areas from potential flooding events.

Managed by the state and situated within the Chicago District of the US Army Corps of Engineers, Turtle Valley Phase III serves as a key component in the overall water infrastructure of the region. Its strategic location and design contribute to the efficient control of water flow, supporting both environmental conservation efforts and climate resilience initiatives. As water resource and climate enthusiasts continue to monitor and assess the dam's performance, its importance in ensuring water safety and security for the surrounding community remains paramount.

Dam Height

12.5

River Or Stream

SUGAR CREEK

Primary Dam Type

Earth

Surface Area

110

Hydraulic Height

11.5

Drainage Area

0.92

Nid Storage

319

Structural Height

12.5

Hazard Potential

Low

Foundations

Soil

Nid Height

13
       
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.