Shakamak Lake Dam Reservoir Report

Last Updated: December 20, 2025

Shakamak Lake Dam in Sullivan, Indiana, stands as a vital water resource for the region, serving primarily for recreational purposes.


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Summary

Constructed in 1930, this Earth-type dam boasts a height of 45 feet and a length of 1150 feet, with a storage capacity of 2500 acre-feet. The dam is situated on the Big Branch of the Louisville District, providing a surface area of 53.13 acres for visitors to enjoy.

Despite its historical significance, Shakamak Lake Dam faces challenges in terms of its condition assessment, which was rated as poor in 2013. With a low hazard potential but high risk assessment, there is a need for improved risk management measures to ensure the safety and longevity of the dam. The last inspection in 2018 highlighted the need for regular upkeep and maintenance to address these concerns and prevent any potential hazards.

For water resource and climate enthusiasts, the Shakamak Lake Dam represents a blend of natural beauty and engineering ingenuity. As a state-regulated structure with inspections and enforcement in place, it remains a cornerstone of the region's water management system. However, ongoing efforts are required to address the poor condition assessment and high risk potential, ensuring the sustainability of this vital water resource for future generations to come.

Year Completed

1930

Dam Length

1150

Dam Height

45

River Or Stream

BIG BRANCH

Primary Dam Type

Earth

Surface Area

53.13

Hydraulic Height

40

Drainage Area

1.55

Nid Storage

2500

Structural Height

45

Outlet Gates

None

Hazard Potential

Low

Nid Height

45
       
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.