Mravik Reservoir Report

Last Updated: December 6, 2025

Mravik, also known as Pershing Wildlife Area, is a state-owned structure located in Taylor, Wisconsin.


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Summary

This dam, designed by the USDA NRCS and completed in 1967, serves a primary purpose beyond traditional water resource management. The Earth-type dam stands at 11 feet high and spans 710 feet in length, with a storage capacity of 160 acre-feet.

Situated on the Trib Fisher River, Mravik plays a crucial role in managing water flow and enhancing conservation efforts in the region. Despite its low hazard potential and fair condition assessment, the structure is subject to regular state inspections, permitting, and enforcement by the Wisconsin Department of Natural Resources. The dam's controlled spillway, with a width of 68 feet, ensures efficient water discharge during peak flow events, contributing to the overall safety and resilience of the surrounding area.

With a risk assessment rating of 'Very High (1)', Mravik underscores the importance of proactive risk management measures and emergency preparedness. While the structure has not been modified in recent years, its critical role in water storage, flood control, and habitat preservation highlights the intersection of water resource management and climate resilience in a changing environment. As enthusiasts in the field of water resources and climate, understanding the significance of structures like Mravik is essential for promoting sustainable practices and safeguarding our natural ecosystems for future generations.

Year Completed

1967

Dam Length

710

Dam Height

11

River Or Stream

TRIB FISHER RIVER

Primary Dam Type

Earth

Surface Area

25

Hydraulic Height

7

Drainage Area

1

Nid Storage

160

Structural Height

11

Hazard Potential

Low

Nid Height

11
       
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.