Borg Reservoir Report

Last Updated: December 5, 2025

Borg, also known as Lake Delavan, is a gravity dam situated in Walworth, Wisconsin, owned and regulated by the local government.


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Summary

Completed in 1935, this dam serves primarily for recreational purposes, with a maximum storage capacity of 21,000 acre-feet and a normal storage capacity of 12,400 acre-feet. The dam stands at a height of 12 feet and has a hydraulic height of 7 feet, with a structural height of 12 feet.

Located on TR Turtle Creek, Borg covers a surface area of 2,072 acres and has a drainage area of 36 square miles. With a maximum discharge of 970 cubic feet per second and a controlled spillway type, this dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its age, Borg has not undergone recent modifications and has a very high risk assessment rating of 1.

It is crucial for water resource and climate enthusiasts to monitor and maintain the safety and integrity of Borg to ensure the protection of surrounding communities and ecosystems. Regular inspections, emergency preparedness plans, and risk management measures should be put in place to address the potential risks associated with this dam and mitigate any potential hazards that may arise in the future.

Year Completed

1935

Dam Length

200

Dam Height

12

River Or Stream

TR TURTLE CREEK

Primary Dam Type

Gravity

Surface Area

2072

Hydraulic Height

7

Drainage Area

36

Nid Storage

21000

Structural Height

12

Hazard Potential

Low

Nid Height

12
       
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.