The Essayons, one of two hopper dredges owned and operated by the Portland District, Army Corps of Engineers, performs emergency dredging on the lower Columbia River near Longview, Washington, July 25. The dredge, operated by a merchant marine crew, helps maintain the entrance bars, rivers and harbors on the coasts of California, Oregon, Hawaii, Alaska and, in emergencies, the Mississippi River. ( Army Corps of Engineers Photo by Chris Gaylord)

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Size: 6016px × 4016px
Photo credit: © APFootage / Alamy / Afripics
License: Licensed
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Keywords: channel, columbia, dredge, essayons, navigation, river, washington