Lake Como Dam is an earth dam located in Johnson County, Illinois, built in 1966. It carries a Significant hazard potential classification.
Dam profile
NID height · 41 ft41 ft tall and 940 ft long, taller than 87% 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 Lake Como Dam
The primary purpose of Lake Como Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Como Acre Incorporated (private). It impounds the Trib Middle Wolf Creek near Carbondale.
The dam stands 41 feet tall and stretches 940 feet across, and has a maximum storage capacity of 254 acre-feet. Completed in 1966, 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 07/26/2024.
At 41 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Carbondale |
| River/Stream | Trib Middle Wolf Creek |
| Coordinates | 37.58891, -89.03057 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 940 ft |
| Year Completed | 1966 (60 years old) |
Storage & Hydraulics
| NID Storage | 254 acre-ft |
| Max Storage | 254 acre-ft |
| Normal Storage | 229 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Como Acre Incorporated |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/26/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00090 |
| Federal ID | IL00090 |
| More Info | State Dam Safety Program |