Waterloo Reservoir 1 Dam Reservoir Report
Last Updated: December 23, 2025
Waterloo Reservoir 1 Dam, located in Monroe County, Illinois, is a privately owned structure with a primary purpose of water supply.
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Summary
Constructed in 1924 by designers LOPINOT & WEBER, this earth dam stands at a height of 31 feet and spans a length of 350 feet, with a maximum storage capacity of 86 acre-feet. The reservoir is situated on the tributary of Fountain Creek and serves as a vital water resource for the surrounding area.
Managed by the Illinois Department of Natural Resources, the dam is regulated, inspected, and enforced to ensure its safety and functionality. With a spillway width of 49 feet and a maximum discharge capacity of 845 cubic feet per second, the dam poses a significant hazard potential and is classified as having a moderate risk level. Despite its age, the condition assessment of the dam is not available, highlighting the need for regular monitoring and maintenance to prevent any potential risks or emergencies.
Waterloo Reservoir 1 Dam plays a crucial role in providing water supply to the region, serving as a key infrastructure for water resource management in Illinois. As climate change continues to impact water availability and quality, the upkeep and proper functioning of such dams become increasingly important to ensure the resilience of our water systems. With its historical significance and vital role in water supply, Waterloo Reservoir 1 Dam serves as a reminder of the importance of sustainable water management practices in the face of changing environmental conditions.
Year Completed |
1924 |
Dam Length |
350 |
Dam Height |
31 |
River Or Stream |
TRIB FOUNTAIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Drainage Area |
0.02 |
Nid Storage |
86 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
31 |
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 1 Dam