Fitzjarrell Lake Dam Reservoir Report

Last Updated: December 21, 2025

Fitzjarrell Lake Dam in Greene, Illinois, is a privately owned structure designed by Hurst Rosche Engineers and completed in 1998.


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Summary

The dam serves primarily for recreation purposes, with a capacity of 453 acre-feet of storage and a normal storage level of 304 acre-feet. It is located on Trib Wolf Creek and has a low hazard potential, with a moderate risk assessment rating.

The earth dam stands at a height of 38 feet and spans 500 feet in length, with a surface area of 25 acres and a drainage area of 0.67 square miles. The spillway, classified as uncontrolled, has a width of 28 feet, allowing for a maximum discharge of 342 cubic feet per second. The dam has not been modified in recent years, and its condition assessment is currently not available.

Despite its relatively low hazard potential, the Fitzjarrell Lake Dam is subject to state regulation, permitting, inspection, and enforcement by the Illinois Department of Natural Resources. Its location in Belltown, Illinois, offers opportunities for recreation and water supply, making it a valuable resource for both residents and visitors alike.

Year Completed

1998

Dam Length

500

Dam Height

38

River Or Stream

TRIB WOLF CREEK

Primary Dam Type

Earth

Surface Area

25

Drainage Area

0.67

Nid Storage

453

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

38
       
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.