Webber Lake Dam Reservoir Report

Last Updated: December 10, 2025

Webber Lake Dam, located in Olney, Illinois, was completed in 1943 and serves as a recreational site for water resource and climate enthusiasts.


°F

°F

mph

Wind

%

Humidity

Summary

The dam, designed by John Henline, is categorized as an Earth dam with a structural height of 22 feet and a length of 393 feet. It has a maximum storage capacity of 77 acre-feet and a normal storage level of 45 acre-feet.

Managed by a private owner, the dam is regulated by the Illinois Department of Natural Resources (IDNR) and is subject to state inspection and enforcement. Despite being classified as having a low hazard potential, the dam poses a moderate risk, with a risk assessment rating of 3. The spillway, classified as uncontrolled, has a width of 55 feet, and the outlet gates are also uncontrolled. The dam's location near the Tributary Fox River offers a picturesque setting for outdoor activities and water recreation.

Overall, Webber Lake Dam stands as a vital infrastructure for recreational purposes in Richland County, Illinois. With its historical significance and scenic surroundings, the dam attracts visitors seeking to engage in water-related activities and enjoy the natural beauty of the area. As a well-maintained structure with moderate risk management measures, Webber Lake Dam continues to provide a safe and enjoyable environment for water resource and climate enthusiasts to explore and appreciate.

Year Completed

1943

Dam Length

393

Dam Height

22

River Or Stream

TRIB FOX RIVER

Primary Dam Type

Earth

Nid Storage

77

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

22
       
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.