Gollon Reservoir Report

Last Updated: December 13, 2025

Located in Taylor, Wisconsin, the Gollon, Bill dam serves as a vital fish and wildlife pond along the Wolf River.


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Summary

Built in 1966, this earth dam stands at a height of 11 feet and spans 1445 feet in length. With a storage capacity of 350 acre-feet, it provides essential support for the surrounding ecosystem.

Maintained by the Wisconsin Department of Natural Resources, the Gollon, Bill dam has a fair condition assessment as of May 2020. Despite its low hazard potential, the risk assessment for this structure is rated as very high, indicating the need for continued monitoring and potential risk management measures. The dam's controlled spillway, with a width of 47 feet, ensures proper water flow and discharge during peak periods.

For water resource and climate enthusiasts, the Gollon, Bill dam offers a fascinating case study in the intersection of infrastructure, ecology, and risk management. Its role in supporting fish and wildlife habitats while managing water flow highlights the importance of sustainable dam operations in safeguarding our natural resources. With ongoing inspections and regulatory oversight, this structure exemplifies the balance between human development and environmental conservation in the face of changing climate patterns.

Year Completed

1966

Dam Length

1445

Dam Height

11

River Or Stream

WOLF RIVER

Primary Dam Type

Earth

Surface Area

45

Hydraulic Height

7

Drainage Area

0.6

Nid Storage

350

Structural Height

11

Hazard Potential

Low

Nid Height

11
       
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.