Neshoto Reservoir Report

Nearby: Eis Mishicot

Last Updated: December 5, 2025

Neshoto, also known as Shoto, is a private-owned dam located on the West Twin River in Manitowoc, Wisconsin.


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Summary

Constructed in 1914, this gravity dam stands at a height of 15 feet with a hydraulic height of 9 feet, serving as a vital structure for water resource management in the area. With a storage capacity of 440 acre-feet and a drainage area of 155 square miles, Neshoto plays a crucial role in controlling the flow of water and ensuring water security for the region.

Despite its age, Neshoto is regularly inspected and maintained by the Wisconsin Department of Natural Resources to ensure its structural integrity and functionality. The dam has a high hazard potential, indicating the potential risks associated with its failure, but its current condition is assessed as fair. Emergency action plans are in place, although last updated in 2012, to mitigate risks and respond effectively in case of emergencies. With a very high risk assessment rating of 1, Neshoto remains a critical infrastructure for water management in the region, requiring ongoing monitoring and maintenance to mitigate potential risks and ensure the safety of surrounding communities.

In conclusion, Neshoto serves as a significant gravity dam on the West Twin River, providing essential water storage and management functions for Manitowoc, Wisconsin. Despite its age and high hazard potential, the dam is actively regulated, inspected, and maintained to ensure its safety and functionality. With a strong risk assessment and emergency preparedness measures in place, Neshoto continues to play a crucial role in water resource management and climate resilience efforts in the region.

Year Completed

1914

Dam Length

2000

Dam Height

15

River Or Stream

WEST TWIN RIVER

Primary Dam Type

Gravity

Surface Area

55

Hydraulic Height

9

Drainage Area

155

Nid Storage

440

Structural Height

15

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

15
       
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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.