Lake Long Bow Dam
Lake Long Bow Dam is an earth dam located in Peoria County, Illinois, built in 1964. It carries a High hazard potential classification.
About Lake Long Bow Dam
The primary purpose of Lake Long Bow Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Long Bow Homeowner Assoc (private). It impounds the E Br Lamarsh Creek near Peoria.
The dam stands 12 feet tall and stretches 300 feet across, and has a maximum storage capacity of 60 acre-feet. Completed in 1964, the structure is well into its service life at over 50 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 04/26/2023.
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 | Peoria |
| Nearest City | Peoria |
| River/Stream | E Br Lamarsh Creek |
| Coordinates | 40.69401, -89.71472 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 300 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Normal Storage | 30 acre-ft |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LAKE LONG BOW HOMEOWNER ASSOC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 04/26/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL50631 |
| Federal ID | IL50631 |
| More Info | State Dam Safety Program |