Alsey Lake Dam
Alsey Lake Dam is an earth dam located in Scott County, Illinois, built in 1969. It carries a Significant hazard potential classification.
About Alsey Lake Dam
Alsey Lake Dam is a dam in Scott, Illinois. The dam is owned by Alsey Manufacturing Company (private). It impounds the Trib Little Sandy Creek near Montezuma.
The dam stands 27 feet tall and stretches 290 feet across, and has a maximum storage capacity of 81 acre-feet. Completed in 1969, 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. The most recent inspection on record was 04/18/2024.
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Location
| State | Illinois |
| County | Scott |
| Nearest City | Montezuma |
| River/Stream | Trib Little Sandy Creek |
| Coordinates | 39.55546, -90.43001 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 290 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 81 acre-ft |
| Max Storage | 81 acre-ft |
| Normal Storage | 54 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | ALSEY MANUFACTURING COMPANY |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 04/18/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00811 |
| Federal ID | IL00811 |
| More Info | State Dam Safety Program |