Illinois Waterway · IL-01
Thomas J. O'Brien Lock
Wait-time history, barge traffic and lock information for Thomas J. O'Brien Lock on the Illinois Waterway. Includes data coverage and source definitions.
- Waterway
- Illinois Waterway
- Location
- Chicago, IL
- River mile
- 326.5
- Chamber length (ft)
- 1000.0
- Chamber width (ft)
- 110.0
- Opened
- 1960.0
Recorded traffic and wait times
| Lock | Waterway | Lockages | Barges | Median commercial wait |
|---|---|---|---|---|
| Thomas J. O'Brien Lock (IL-01) | Illinois Waterway | 497 | 400 | 0.00 h |
90th-percentile commercial wait: 0.33 hours. Commercial lockages recorded: 109.
Recorded arrivals: 2026-09-04T15:55 to 2026-10-04T15:45 (CST, as reported).
Status snapshot collected: 2026-10-05T14:09Z. Tows pending: 0. Reported four-hour average delay: 0.0 minutes.
Page data built 2026-10-05T14:17:12Z. Wait means arrival to start of lockage. Recent completed passages may understate delays while other tows remain waiting. See definitions and limitations.