Navarino Marsh 3 Reservoir Report

Last Updated: December 6, 2025

Navarino Marsh 3, also known as Wolf River South Pool, is a state-owned water resource located in Shawano, Wisconsin.


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Summary

This Earth dam, completed in 1971, serves a primary purpose that falls under the category of "Other," with a normal storage capacity of 160 acre-feet and a maximum storage of 920 acre-feet. The dam stands at a height of 9.2 feet and spans a length of 4925 feet, adjacent to the Wolf River.

Despite being classified as having a low hazard potential, Navarino Marsh 3 poses a very high risk due to its location and surrounding environment. The dam has not been rated for its condition assessment, indicating a need for further evaluation and potential maintenance. While it is under state jurisdiction and regulation by the Wisconsin Department of Natural Resources, the last inspection of the dam took place in July 2011, with a recommended inspection frequency of 10 years.

Given its critical role in water management and flood control, Navarino Marsh 3 is a vital component of the local ecosystem and community. Climate enthusiasts and water resource experts alike can appreciate the significance of this structure in maintaining the delicate balance of water levels in the area. As efforts continue to ensure the safety and integrity of this dam, its importance in managing water resources in Shawano, Wisconsin, cannot be overstated.

Year Completed

1971

Dam Length

4925

Dam Height

9.2

River Or Stream

ADJACENT TO WOLF RIVER

Primary Dam Type

Earth

Surface Area

150

Hydraulic Height

9.2

Drainage Area

0.7

Nid Storage

920

Structural Height

9.2

Hazard Potential

Low

Nid Height

9
       
Seasonal Comparison

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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.