Mississippi River · MI-21
Lock and Dam 21
Wait-time history, barge traffic and lock information for Lock and Dam 21 on the Mississippi River. Includes data coverage and source definitions.
- Waterway
- Mississippi River
- Location
- Quincy, IL
- River mile
- 324.9
- Chamber length (ft)
- 600.0
- Chamber width (ft)
- 110.0
- Opened
- 1938.0
Recorded traffic and wait times
| Lock | Waterway | Lockages | Barges | Median commercial wait |
|---|---|---|---|---|
| Lock and Dam 21 (MI-21) | Mississippi River | 219 | 1,307 | 0.57 h |
90th-percentile commercial wait: 1.98 hours. Commercial lockages recorded: 155.
Recorded arrivals: 2026-09-04T17:50 to 2026-10-04T11:50 (CST, as reported).
Status snapshot collected: 2026-10-05T14:09Z. Tows pending: 0. Reported four-hour average delay: 10.0 minutes.
Page data built 2026-10-05T14:21:30Z. Wait means arrival to start of lockage. Recent completed passages may understate delays while other tows remain waiting. See definitions and limitations.
Other locks on this waterway
- Chain of Rocks Lock and Dam 27 (MI-27)
- Lock 19 (MI-19)
- Lock and Dam 1 (MI-01)
- Lock and Dam 10 (MI-10)
- Lock and Dam 11 (MI-11)
- Lock and Dam 12 (MI-12)
- Lock and Dam 13 (MI-13)
- Lock and Dam 14 (MI-14)
- Lock and Dam 15 (MI-15)
- Lock and Dam 16 (MI-16)
- Lock and Dam 17 (MI-17)
- Lock and Dam 18 (MI-18)
- Lock and Dam 2 (MI-02)
- Lock and Dam 20 (MI-20)
- Lock and Dam 22 (MI-22)
- Lock and Dam 24 (MI-24)
- Lock and Dam 25 (MI-25)
- Lock and Dam 3 (MI-03)
- Lock and Dam 4 (MI-04)
- Lock and Dam 5 (MI-05)
- Lock and Dam 5A (MI-55)
- Lock and Dam 6 (MI-06)
- Lock and Dam 7 (MI-07)
- Lock and Dam 8 (MI-08)
- Lock and Dam 9 (MI-09)
- Mel Price Lock and Dam (MI-26)
- St Anthony Falls - Lower Lock (MI-52)
- St Anthony Falls - Upper Lock (MI-51)