Waterloo New Reservoir Dam Reservoir Report
Last Updated: December 22, 2025
The Waterloo New Reservoir Dam, located in Monroe County, Illinois, was completed in 1961 and serves as a vital water supply source for the surrounding area.
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Summary
The dam stands at a height of 42 feet and spans 1800 feet, with a storage capacity of 774 acre-feet and a surface area of 34 acres. Designed by Lopinot & Weber, this earth dam with a buttress core type is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its safety and functionality.
This significant dam on the tributary of Fountain Creek plays a crucial role in managing water resources in the region, with a maximum discharge capacity of 900 cubic feet per second. Despite its age, the dam's condition assessment is currently listed as "Not Available," indicating a potential need for further evaluation and maintenance. The hazard potential of the dam is considered significant, highlighting the importance of ongoing risk management measures to safeguard against potential emergencies.
With its impressive storage capacity and essential role in water supply, the Waterloo New Reservoir Dam stands as a key infrastructure asset in Illinois. As climate change continues to impact water resources, the proper maintenance and management of dams like this one are crucial to ensure a reliable and sustainable water supply for the community. As enthusiasts of water resources and climate resilience, staying informed about the condition and management of dams like Waterloo New Reservoir is essential for promoting environmental stewardship and effective water resource management.
Year Completed |
1961 |
Dam Length |
1800 |
Dam Height |
42 |
River Or Stream |
TRIB FOUNTAIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
34 |
Drainage Area |
0.5 |
Nid Storage |
774 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
42 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Waterloo New Reservoir Dam