Pacific Rivers: Snake River/Lower Monumental Caution to Vessels

Lower Monumental Caution to Vessels

Notice Number: 19647
Date: 04/22/2022 thru 05/30/2022

Vessels transiting the Lower Monumental navigation lock will incur unpredictable currents at the downstream end of the lock due to the need to remove four spillway gates from service.  The spillway gates have maintenance issues which must be addressed before they are returned to service.

Vessel operators should contact the Lower Monumental lock operator at (509) 282-7231 or on the marine band to call sign WUJ43 (Lower Monumental) no earlier than 30 minutes prior to transiting the lock to obtain the latest information related to flows in the dam tailrace or for further assistance.


Lower Monumental Lock and Dam - Snake River Mile 41.6

This caution to vessels will remain in place until repairs can be completed to the spillway gates.  These repairs are planned for completion by 1700 on 30 May 2022.

For additional information on this work contact the NWW Operations Division at (509) 527-7364.



Kenny Koebberling
Navigation Business Line Manager
Walla Walla District, USACE