Roodhouse Lake Dam Reservoir Report
Last Updated: December 21, 2025
Roodhouse Lake Dam in Greene County, Illinois, stands as a vital structure managed by the USDA NRCS for recreational purposes.
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Summary
Completed in 1974, this Earth-type dam boasts a height of 26 feet and a length of 495 feet, providing a storage capacity of 191 acre-feet. Situated on TRIB WOLF RUN, the dam's spillway type is uncontrolled, with a width of 67 feet, while its hazard potential is classified as low.
Despite its low hazard potential, the dam undergoes regular inspections, with the last one conducted in June 2020. With a moderate risk assessment, the dam's emergency action plan status, condition assessment, and risk management measures are currently not available. Owned by the local government and regulated by the IDNR, Roodhouse Lake Dam offers a peaceful recreational spot in the city of BERDAN-OFFSTREAM, attracting water resource and climate enthusiasts seeking a serene escape in the heart of Illinois.
Year Completed |
1974 |
Dam Length |
495 |
Dam Height |
26 |
River Or Stream |
TRIB WOLF RUN |
Primary Dam Type |
Earth |
Nid Storage |
191 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Macoupin Creek Near Kane
|
20cfs |
Illinois River At Valley City
|
4670cfs |
Bay Creek At Pittsfield
|
43cfs |
La Moine River At Ripley
|
23cfs |
Mill Creek Near Florissant
|
0cfs |
Spring Creek At Springfield
|
6cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Roodhouse Lake Dam