Award Notice - MOUTH OF THE COLUMBIA RIVER - NORTH JETTY MAJOR MAINTENANCE - PHASE II -

This award announcement is for the North Jetty Major Maintenance – Phase II, Klickitat County, Washington. The MCR federal navigation project is situated at the border between Washington and Oregon, where the Columbia River meets the Pacific Ocean. Deep-draft navigation through the MCR is facilitated by three primary navigation structures-North Jetty, South Jetty, and Jetty A-with a combined authorized length of 10.2 miles.

The North Jetty has an authorized length of 2.5 miles extending to Station 130+00; however, it has not been constructed to its full authorized length. The initial construction of the North Jetty concluded at approximately Station 122+00, resulting in a constructed length of approximately 2.3 miles.

This jetty was the second of the three to be constructed and was completed in 1917. Subsequent repairs and rehabilitations along various sections of the North Jetty were carried out in 1939, 1965, 2005, 2015, and 2019. Both initial construction and repairs utilized stone with a minimum density ranging from 167 to 180 pounds per cubic foot (pd). The side slopes of the jetty vary between 1:1.25 and 1:2 (vertical: horizontal), with an average crest elevation of 25 ft msl.

Since construction, a total of 3,569,030 tons of armor stone have been placed. The Mouth of the Columbia River (MCR) North Jetty is located at the southwest corner of Washington State near Ilwaco, WA. Access to the north jetty is from N Head Rd and Cape Disappointment State Park. Mandatory work for MCR North Jetty Expedited Repairs includes toe, side slope, and crest repair construction above -5 feet NAVD88 elevation along approximately 900 feet of the jetty trunk primarily on the ocean side.

These sections will be repaired and reconstructed to a design crest width of 30 feet, side slopes of 1V:2H and a crest elevation of +24.5 feet NAVD88. The estimated stone volume required for the repairs is approximately 11,100 cubic yards with an approximate minimum stone densities of 185 pounds per cubic foot. Expected stone size is between 20-40 tons each. A jetty crest haul road on top of the jetty must be constructed and staging area developed to store the large quantity of jetty armor stone.