Meshach Lake Dam Reservoir Report

Last Updated: December 23, 2025

Meshach Lake Dam, also known as Royal Lake, is a privately owned structure located in Macoupin County, Illinois.


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Summary

Completed in 1970, this earth dam stands at a height of 25 feet and has a length of 232 feet, providing a storage capacity of 121 acre-feet for recreational purposes. Situated on the TRIB COOP BRANCH river, the dam boasts an uncontrolled spillway with a width of 15 feet, ensuring a maximum discharge of 90 cubic feet per second.

Managed by the Illinois Department of Natural Resources, Meshach Lake Dam has a low hazard potential and a moderate risk rating. Despite its age, the dam has not undergone a recent condition assessment and its emergency action plan status is not available. With a history of state regulation, inspection, and enforcement, the dam continues to provide essential recreational water resources for the local community. Water resource and climate enthusiasts can appreciate the unique design and function of this dam as it contributes to the conservation and enjoyment of Meshach Lake.

As an integral part of the St. Louis District's water infrastructure, Meshach Lake Dam remains a key feature in the region's water management system. With a surface area of 9 acres and a drainage area of 0.25 square miles, the dam plays a crucial role in maintaining water levels and ensuring safe recreational activities for visitors. The dam's location in the beautiful city of Hardin adds to its appeal, making it a popular destination for outdoor enthusiasts and nature lovers alike.

Year Completed

1970

Dam Length

232

Dam Height

25

River Or Stream

TRIB COOP BRANCH

Primary Dam Type

Earth

Surface Area

9

Drainage Area

0.25

Nid Storage

121

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
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.