Monongahela River · MN-24
Lock and Dam 4
Wait-time history, barge traffic and lock information for Lock and Dam 4 on the Monongahela River. Includes data coverage and source definitions.
- Waterway
- Monongahela River
- Location
- Monessen, PA
- River mile
- 41.5
- Chamber length (ft)
- 720.0
- Chamber width (ft)
- 56.0
- Opened
- 1932.0
Recorded traffic and wait times
| Lock | Waterway | Lockages | Barges | Median commercial wait |
|---|---|---|---|---|
| Lock and Dam 4 (MN-24) | Monongahela River | 216 | 759 | 0.00 h |
90th-percentile commercial wait: 0.54 hours. Commercial lockages recorded: 159.
Recorded arrivals: 2026-09-04T19:16 to 2026-10-04T15:32 (EST, 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.