Waverly City Lake Dam Reservoir Report
Last Updated: December 21, 2025
Waverly City Lake Dam is a vital water resource infrastructure located in Morgan County, Illinois, along Woods Creek.
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Summary
This earth dam, completed in 1939, serves primarily for water supply purposes with a maximum storage capacity of 2536 acre-feet and a normal storage of 809 acre-feet. The dam stands at a height of 35 feet and spans 496 feet in length, covering a surface area of 64 acres.
Managed by the local government, the dam is regulated by the Illinois Department of Natural Resources (IDNR) and undergoes regular inspections, with the last one conducted in June 2020. Classified with a low hazard potential, the dam poses a moderate risk level, indicating a need for ongoing risk management measures. With an uncontrolled spillway and outlet gates, the dam has a maximum discharge capacity of 14520 cubic feet per second, ensuring effective water flow management during periods of high water levels.
Waverly City Lake Dam serves as a critical infrastructure for water supply in the region, highlighting the importance of its maintenance and management to ensure the safety and sustainability of water resources in Morgan County, Illinois. Enthusiasts of water resources and climate will find interest in the dam's design features, regulatory oversight, and risk assessment, emphasizing the intersection of water management and environmental conservation in the local community.
Year Completed |
1939 |
Dam Length |
496 |
Dam Height |
35 |
River Or Stream |
WOODS CREEK |
Primary Dam Type |
Earth |
Surface Area |
64 |
Drainage Area |
9.3 |
Nid Storage |
2536 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Spring Creek At Springfield
|
6cfs |
South Fork Sangamon River Nr Rochester
|
14cfs |
Sangamon River At Petersburg
|
199cfs |
Sangamon River At Riverton
|
188cfs |
Macoupin Creek Near Kane
|
20cfs |
Illinois River At Valley City
|
4670cfs |
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.
Waverly City Lake Dam