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Mouth of the Columbia River Jetty System Major Rehabilitation Project

The Mouth of the Columbia River's jetty system was built from 1885 - 1939. The system consists of three rubble-mound jetties with a total length of 9.7 miles, constructed on massive tidal shoals and designed to minimize navigation channel maintenance and provide safe transit between the Pacific Ocean and the Columbia River.


The north and south jetties have been repaired several times since original construction; the latest repairs occurred in 2005 on the North Jetty and 2006-2007 on the South Jetty. Jetty "A" has only been repaired once since initial construction, in 1965. The recent repairs on the jetties were interim repairs, designed to maintain jetty functionality until a longer-term maintenance and repair plan was designed.


Many areas of each structure are severely damaged due to the extreme waves of the Pacific Ocean interacting with the Columbia River. The structures are routinely exposed to ocean waves ranging from 10 to 20 feet high. The increased storm activity and the loss of sand shoal material upon which they are built have taken a toll on the structural integrity of the jetties.


Of primary concern are critical portions of the jetties, which could breach during a large storm event, allowing sand to be transported and deposited directly into the federal navigation channel. Such an event could shut down commercial navigation at the entrance to the river system, requiring expensive emergency repairs to the jetty and dredging to restore channel depth.

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About this project

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In Oct. 2013 the Corps completed efforts to stabilize the foredune adjacent to the south jetty’s root, preventing further erosion and minimizing the risk of a breach. The next phase of the jetty system rehabilitation shifts the Corps’ attention to the North Jetty. Project design plans are entering the final stages and the Corps expects construction to begin in Nov. 2014.

Plans for future phases of the rehabilitation of the MCR jetty system are still in the early stages.

Construction timeline (subject to change)

2014 - 2015  North jetty lagoon fill
2015 - 2016 North jetty critical repairs
2015 - 2016     Jetty A rehabilitation
2016 - 2019 North jetty rehabilitiation
2017 - 2021 South jetty rehabilitation

 

The Corps will work closely with Cape Disappointment State Park to minimize impacts to public areas, and to alert park visitors to impacts that cannot be avoided. Park visitors should be prepared for construction traffic and traffic delays; some parking lot closures; and construction-related noise during the day and possibly at night, particularly during the summer months.