Lake Ellyn Dam is a rockfill dam located in DuPage County, Illinois, built in 1991. It carries a Significant hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 200 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic rockfill embankment section and the water level is illustrative.
About Lake Ellyn Dam
The primary purpose of Lake Ellyn Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Glen Ellyn Park District (private). It impounds the Trib East Branch Dupage River near Glen Ellyn.
The dam stands 12 feet tall and stretches 200 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 96 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1991, the structure is 35 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 02/02/2023.
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Location
| State | Illinois |
| County | DuPage |
| Nearest City | Glen Ellyn |
| River/Stream | Trib East Branch Dupage River |
| Coordinates | 41.88367, -88.05794 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 200 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 96 acre-ft |
| Max Storage | 96 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 28 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Glen Ellyn Park District |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 02/02/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50298 |
| Federal ID | IL50298 |
| More Info | State Dam Safety Program |