Illustration of a map of the Swinomish Channel, a federal navigation channel located between the eastern shore of Fidalgo Island and the mainland at the western edge of Skagit County, Washington. U.S. Army Corps of Engineers officials will oversee operations to dredge accumulated shoaling along the 11-mile long, 100-feet wide, and 12-feet deep channel, to provide safe passage for vessels transiting between Skagit Bay and Padilla Bay, Washington.