![]() Army Corps of Engineers Hydraulic Engineer and co-author of the study. “This work is the culmination of more than 20 years of research, experimentation, and, ultimately, collaboration among local regulators, industry stakeholders, and state and federal agencies to do the right thing, based on what the science was telling us” said Hans R. Map showing mouth of the Columbia River, with historical shorelines, from the paper Historical evolution of the Columbia River littoral cell Army Corps of Engineers dredges between 2 and 4 million cubic meters (about 800-1600 Olympic swimming pools worth) of sediment from the six-mile-long entrance channel at the river mouth each year to maintain safe passage for large vessels. ![]() As the largest river by volume flowing from the Americas into the Pacific Ocean, the Columbia transports an estimated 5 million tons of sediment downstream toward its mouth each year. ![]() The river also moves large amounts of sediment eroded from the landscape, depositing it into the vast river system. The Columbia-Snake River System is a conduit for commerce, carrying millions of tons of international trade by large container vessels each year. Sandy coastlines are a valuable resource that protect human-made structures from waves, serve as habitat for important species, and provide a variety of recreational opportunities. The USGS uses a variety of survey tools-including jet skis equipped with GPS and sonar-to measure how sandy coastlines change over time. Sources/Usage: Some content may have restrictions.
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