Peoria Lock and Dam is a concrete dam located in Tazewell County, Illinois, built in 1939. It carries a Significant hazard potential classification.
Dam profile
NID height · 23 ft23 ft tall and 536 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Peoria Lock and Dam
The primary purpose of Peoria Lock and Dam is navigation. The dam maintains water levels sufficient for boat and barge traffic, supporting commercial or recreational navigation on the waterway. The dam is owned by USACE - Rock Island District (federal). It impounds the Illinois River near North Pekin.
The dam stands 23 feet tall and stretches 536 feet across, has a maximum storage capacity of 225,000 acre-feet, and collects water from a drainage area of 14,544 square miles. Completed in 1939, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 07/22/2021.
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Location
| State | Illinois |
| County | Tazewell |
| Nearest City | North Pekin |
| River/Stream | Illinois River |
| Coordinates | 40.63170, -89.62450 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 23 ft |
| Dam Length | 536 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 225,000 acre-ft |
| Max Storage | 225,000 acre-ft |
| Drainage Area | 14,544 sq mi |
| Max Discharge | 111,000 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - Rock Island District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/22/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IL01014 |
| Federal ID | IL01014 |
| More Info | State Dam Safety Program |