Waterloo New Reservoir Dam is an earth dam located in Monroe County, Illinois, built in 1961. It carries a Significant hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 1,800 ft long, taller than 88% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Waterloo New Reservoir Dam
The primary purpose of Waterloo New Reservoir Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Waterloo (local government). It impounds the Trib Fountain Creek near Waterloo-offstream.
The dam stands 42 feet tall and stretches 1,800 feet across, creates a reservoir covering 34 acres, has a maximum storage capacity of 774 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1961, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 04/08/2022.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Illinois |
| County | Monroe |
| Nearest City | Waterloo-offstream |
| River/Stream | Trib Fountain Creek |
| Coordinates | 38.31437, -90.16775 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 1,800 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 774 acre-ft |
| Max Storage | 774 acre-ft |
| Normal Storage | 586 acre-ft |
| Surface Area | 34 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 900 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Waterloo |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 04/08/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL00271 |
| Federal ID | IL00271 |
| More Info | State Dam Safety Program |