Cedar Lake Dam is an earth dam located in Johnson County, Illinois, built in 1973. It carries a Significant hazard potential classification.
Dam profile
NID height · 24 ft24 ft tall and 1,330 ft long. 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 Cedar Lake Dam
The primary purpose of Cedar Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is private-owned. It impounds the Trib Max Creek near Grantsburg.
The dam stands 24 feet tall and stretches 1,330 feet across, and has a maximum storage capacity of 60 acre-feet. Completed in 1973, 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 05/26/2023.
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Location
| State | Illinois |
| County | Johnson |
| Nearest City | Grantsburg |
| River/Stream | Trib Max Creek |
| Coordinates | 37.49971, -88.79901 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 1,330 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 35 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 05/26/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00032 |
| Federal ID | IL00032 |
| More Info | State Dam Safety Program |