Saganashkee Slough 1 Dam is an earth dam located in Cook County, Illinois, built in 1948. It carries a Significant hazard potential classification.
Dam profile
NID height · 14 ft14 ft tall and 950 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 Saganashkee Slough 1 Dam
The primary purpose of Saganashkee Slough 1 Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Forest Preserve District of Cook County (local government). It impounds the Trib Calumet Sag Channel near Lemont.
The dam stands 14 feet tall and stretches 950 feet across, and has a maximum storage capacity of 2,379 acre-feet. Completed in 1948, the structure is well-established, with more than 75 years of service.
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 10/02/2023.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Cook |
| Nearest City | Lemont |
| River/Stream | Trib Calumet Sag Channel |
| Coordinates | 41.69393, -87.89098 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 950 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 2,379 acre-ft |
| Max Storage | 2,379 acre-ft |
| Normal Storage | 718 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Forest Preserve District of Cook County |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/02/2023 |
| Emergency Action Plan | No |
Identifiers
| NID ID | IL00870 |
| Federal ID | IL00870 |
| More Info | State Dam Safety Program |