Pike Lake Reservoir Report

Last Updated: December 5, 2025

Pike Lake, located in Hartford, Wisconsin, is a privately-owned recreational lake regulated by the Wisconsin Department of Natural Resources.


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Summary

The dam at Pike Lake, completed in 1870, stands at a height of 12 feet and has a gravity design, serving primarily for recreation purposes. With a normal storage capacity of 1,040 acre-feet, the lake covers a surface area of 522 acres and has a drainage area of 13 square miles.

Despite its low hazard potential and fair condition assessment, Pike Lake is at a very high risk level according to the data, indicating potential challenges in risk management. The last inspection in August 2020 revealed no major concerns, with a relatively low inspection frequency of 10 years. The controlled spillway and overall structure of Pike Lake contribute to its safety and operational efficiency, with the lake being a popular destination for water resource and climate enthusiasts in the region.

Years Modified

1957 - Other

Year Completed

1870

Dam Length

200

Dam Height

12

River Or Stream

TRIB. RUBICON RIVER

Primary Dam Type

Gravity

Surface Area

522

Hydraulic Height

2

Drainage Area

13

Nid Storage

5740

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.