Poysippi Reservoir Report

Last Updated: December 5, 2025

Poysippi, located in Waushara County, Wisconsin, is home to the Pine Creek dam, a hydroelectric facility completed in 1935 with a primary purpose of generating electricity.


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Summary

With a dam height of 9 feet and a storage capacity of 250 acre-feet, the facility also serves flood risk reduction and recreation purposes. The dam, with a length of 204 feet and a surface area of 57 acres, controls a drainage area of 131 square miles and has a maximum discharge capacity of 1465 cubic feet per second.

Managed by the Federal Energy Regulatory Commission (FERC), the Pine Creek dam has a low hazard potential and a moderate risk assessment score. While the dam is not state-regulated, it is subject to federal oversight for operations, inspections, and enforcement. The spillway, with a width of 12 feet, is uncontrolled, and the facility has not been assessed for condition or emergency action plan preparedness in recent years. Despite its age, the dam continues to play a vital role in the region's water resource management and energy production efforts.

Year Completed

1935

Dam Length

204

Dam Height

9

River Or Stream

Pine Creek

Surface Area

57

Hydraulic Height

9

Drainage Area

131

Nid Storage

250

Hazard Potential

Low

Nid Height

9
       
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.