Snake River · SN-02
Lower Monumental Lock and Dam
Wait-time history, barge traffic and lock information for Lower Monumental Lock and Dam on the Snake River. Includes data coverage and source definitions.
- Waterway
- Snake River
- Location
- Kahlotus, WA
- River mile
- 41.6
- Chamber length (ft)
- 675.0
- Chamber width (ft)
- 86.0
- Opened
- 1969.0
Recorded traffic and wait times
| Lock | Waterway | Lockages | Barges | Median commercial wait |
|---|---|---|---|---|
| Lower Monumental Lock and Dam (SN-02) | Snake River | 82 | 119 | 0.08 h |
90th-percentile commercial wait: 0.08 hours. Commercial lockages recorded: 42.
Recorded arrivals: 2026-09-04T18:00 to 2026-10-04T07:10 (PST, as reported).
No live status available for this lock.
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.