KAHLOTUS, Wash. – Vehicle crossings at Lower Monumental Lock and Dam will be temporarily closed from April 17 through May 1 to accommodate maintenance activities to occur on top of the dam, according to operations officials with the U.S. Army Corps of Engineers’ Walla Walla District.
The temporary closure to public traffic across the dam, located at Snake River mile 41.6, near Kahlotus, Washington, is necessary for public safety while maintenance staff repairs two monolith joint seals. The seals prevent river water on the upstream side of the dam from entering the concrete structure. The existing water stop seals have been in service since the dam's construction during the 1960s and are in need of replacement. Workers will erect a concrete drilling platform on the dam’s roadway deck to facilitate repairs.
Travelers can call 1-888-DAM-INFO (1-888-326-4636) for the most current dam-crossing information at all three of Walla Walla District’s dams that allow public traffic to cross the Snake River: Lower Monumental; Little Goose, near Starbuck; and Lower Granite, near Pomeroy.
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Release no. 17-048