Waterloo Reservoir 2 Dam Reservoir Report
Last Updated: December 22, 2025
Waterloo Reservoir 2 Dam, located in Monroe County, Illinois, was completed in 1950 and serves as a vital water supply source for the city of Waterloo.
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Summary
With a dam height of 19 feet and a length of 400 feet, this earth dam has a storage capacity of 110 acre-feet and a normal storage level of 61 acre-feet. The dam is state-regulated by the Illinois Department of Natural Resources (IDNR) and is designed to control the flow of the tributary Fountain Creek.
Managed by the local government, Waterloo Reservoir 2 Dam has a significant hazard potential and is categorized as having a moderate risk level. The dam features an uncontrolled spillway and outlet gates, with a maximum discharge capacity of 310 cubic feet per second. The dam has undergone regular inspections, with the last one conducted in July 2018, and is deemed to be in a condition that is currently not available for assessment. Despite its age, Waterloo Reservoir 2 Dam continues to play a crucial role in water resource management and climate resilience efforts in the region.
For water resource and climate enthusiasts, Waterloo Reservoir 2 Dam represents a key infrastructure asset in Illinois, providing essential water supply services while also posing significant risk management challenges. With its historical significance and ongoing regulatory oversight, this dam serves as a reminder of the importance of maintaining and monitoring critical water infrastructure to ensure the safety and security of communities in the face of changing environmental conditions.
Year Completed |
1950 |
Dam Length |
400 |
Dam Height |
19 |
River Or Stream |
TRIB FOUNTAIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
11 |
Drainage Area |
0.2 |
Nid Storage |
110 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
19 |
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 Reservoir 2 Dam