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August 24 2025 Vol. IX • No. 17
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J.E. McAmis Finishing Long-Term Jetty Project Along Columbia River By Lori Tobias CEG CORRESPONDENT
A crane lifts a jetty armor stone into place while a Komatsu PC1250-11 excavator works in the foreground.
Work on the largest rubble mound jetty in the world is coming to a close, ending 10 years of continuous jetty work in Clatsop County, Ore. The South Jetty on the Columbia River, one of three jetties making up the river jetty system, is the last of the three to undergo critical repair work. The $172 million project got under way in 2019, following work on Jetty A and the North Jetty. “Where are we with that now is we’re nearing completion of a six-year project,” said Colter Bennett, U.S. Army Corps of Engineers project engineer. “We’re in the final stretches of the final season. In terms of stone placement, I think we're a month away, but the site still needs major site restoration.” The South Jetty was originally built starting in 1885 and has undergone repairs 10 times since then, Bennett said. “This effort is the largest stone quantity that's been put on the jetty in a single project since the original construction.” By the project’s end, the contractor, J.E. McAmis, of Chico, Calif., will install 450,000 tons of jetty armor stone. “One way to think of it is that is about 34,000 Volkswagen Beetles,” Bennett said. “As a result of the jetty’s size, the contractor had to go many different places to find the quantity of rock. The production rate of jetty armor stone is slow, so you have to go to multiple quarries that are producing armor stone at the same time — and producing fast enough — to finish the job on time. They had seven main contributing sources of stone, and all of these sources are in both Oregon and Washington.” see JETTY page 10
This Cat 6020B excavator is outfitted with a customized front end, boom, stick, bucket and thumb specifically for jetty work.
Only two excavators worldwide are fitted with this configuration.
Repairs are nearly complete on the South Jetty on the Columbia River.