Lost Nation Country Club Lake Dam Reservoir Report

Last Updated: December 13, 2025

Lost Nation Country Club Lake Dam, located in Grand Detour, Illinois, is a privately owned earth dam built in 1975 primarily for recreational purposes.


°F

°F

mph

Wind

%

Humidity

Summary

The dam stands at a height of 30 feet and spans a length of 570 feet, with a storage capacity of 1013 acre-feet. Situated on Clear Creek, the dam is regulated by the Illinois Department of Natural Resources and undergoes regular state inspections to ensure its safety and compliance with regulations.

With a low hazard potential and moderate risk assessment, Lost Nation Country Club Lake Dam is considered to be in relatively good condition, though specific details on its current state are not available. The dam features an uncontrolled spillway and outlet gates, and is not associated with any other structures. While it does not have an Emergency Action Plan prepared, the dam is subject to regular inspections every five years to monitor its integrity and address any potential risks.

For water resource and climate enthusiasts, Lost Nation Country Club Lake Dam serves as a notable example of a privately owned recreational dam in Illinois. Its construction and design details, as well as its regulatory oversight by the state authorities, offer valuable insights into the management of dams for leisure purposes. Despite its low hazard potential, ongoing inspections and risk assessments ensure the safety of this structure and its surrounding area along Clear Creek.

Year Completed

1975

Dam Length

570

Dam Height

30

River Or Stream

CLEAR CREEK

Primary Dam Type

Earth

Nid Storage

1013

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

30
       
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.