Tullamore Dam
Tullamore Dam is an earth dam located in Lake County, Illinois, built in 1994. It carries a High hazard potential classification.
About Tullamore Dam
The primary purpose of Tullamore Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Mundelein Park & Recreation District (local government). It impounds the Seavey Drainage Ditch near Mundelin.
The dam stands 17 feet tall and stretches 600 feet across, and has a maximum storage capacity of 106 acre-feet. Completed in 1994, the structure is 32 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. An emergency action plan is in place for this dam. The most recent inspection on record was 05/21/2025.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Illinois dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Illinois |
| County | Lake |
| Nearest City | Mundelin |
| River/Stream | Seavey Drainage Ditch |
| Coordinates | 42.27414, -88.02264 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 600 ft |
| Year Completed | 1994 (32 years old) |
Storage & Hydraulics
| NID Storage | 106 acre-ft |
| Max Storage | 106 acre-ft |
| Normal Storage | 20 acre-ft |
| Max Discharge | 1,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | MUNDELEIN PARK & RECREATION DISTRICT |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 05/21/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50260 |
| Federal ID | IL50260 |
| More Info | State Dam Safety Program |