US ARMY CORPS OF ENGINEERS

CENWP-PM-E-17-06

Kate Wells
(503) 808-4664
kathleen.a.wells@usace.army.mil

MULTI COUNTIES

SW

201704725

DS/SCOPING, NEPA

09/08/2017

11/16/2017

The Lower Columbia River Federal Navigation Channel; Project includes a main channel that is 43 feet deep and generally 600 feet wide, and extends upstream of the Mouth of Columbia River, River Mile (RM) 3 to Vancouver, WA, RM 105.5. The channel also extends into lower Oregon Slough and includes vessel turning basins at Astoria in Oregon and Longview, Kalama, and Vancouver in WA. The channel is maintained using a combination of dredging and hydraulic control works (pile dikes). Advanced maintenance dredging is currently approved up to 5 feet below authorized depth (-48 feet) and up to 100 feet outside the authorized channel width. For the past several years, dredging 6 to 8 million cubic yards of localized sand shoals has been required annually to provide reliable service for deep-draft navigation.

The U.S. Army Corps of Engineers (Corps) is the lead agency under the National Environmental Policy Act (NEPA). The Ports of Longview, Kalama, Woodland, and Vancouver (Washington Ports) along with the Port of Portland in Oregon (collectively, the Sponsor Ports) are cooperating agencies under NEPA. In addition, the Washington Ports are co-lead agencies under the State Environmental Policy Act (SEPA) with the Port of Longview serving as the SEPA nominal lead agency.

Address: extends upstream of the Mouth of Columbia River, RM 3 to Vancouver, RM 105.5. The channel also extends into lower Oregon Slough & includes vessel turning basins at Astoria in Oregon & Longview, Kalama, & Vancouver

U.S. Army Corps of Engineers