US Army Corps of Engineers
Portland District

Building Strong® at Tillamook Bay

2 aerial images of Tillamook BayTillamook Bay is on the Oregon coast, 50 miles south of the Columbia River.


The Corps owns and maintains two jetties at Tillamook Bay's entrance. The north jetty, originally built in 1914, was reconstructed and extended to its authorized length of 5,700 feet in 1931. A revetment was constructed in 2004 to help prevent shoreline erosion and protect the vulnerable north jetty root. In 1965, construction of an 8,000-foot-long south jetty was authorized. Work began in 1969; the first segment was finished in 1971. Construction of the second seg­ment was completed in 1974. Construction of the third segment— 1,500 feet to complete the 8,000-foot jetty— started in 1978 and was completed in 1979.


In spite of extensive rehabilitation over the years, the increasingly tumultuous Pacific Ocean environment has caused recession of both the north and south jetties. The revetment has also experienced some damage caused by wave overtopping which over time destabilizes the stones and causes erosion within the structure. A 2010 rehabilitation project capped the north jetty at its current length of 5,213 feet and made necessary repairs to the revetment. Corps contractors placed more than 1,000 stones weighing 25 to 50 tons each on existing relic stone base, creating a new jetty cap. Jetty head repairs created a broader, higher and more substantial structure to withstand the attack of powerful waves. The 100-foot cap on the north jetty is designed to stop further recession of the jetty, stabilize the jetty head, and reduce forces on the trunk and root of the jetty.


The Corps of Engineers does not maintain recreation facilities at this location. Stay off the jetties as they are hazardous and not intended for recreational use. Nearby adjacent recreational facilities fall under the jurisdiction of private, local or state agencies. Learn more about jetties and why they are unsuitable for recreation at Understanding Coastal Jetties.

For more information

Oregon Coastal Harbors pamphlet

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Phone: 503-808-4510

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Operations: Tillamook Bay

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The Corps maintains an 18-foot-deep channel over the ocean bar at the entrance to Tillamook Bay; an 18-foot-deep, 200-foot-wide, three-mile-long channel to Miami Cove; a turning basin at Miami Cove; and a 12-foot-deep access channel to the Garibaldi small-boat basin. The Corps’ navigation authority includes protection of Bayocean Peninsula to preserve the present entrance channel to the bay. For that purpose, a 1.4-mile-long dike was constructed to close a breach in the peninsula between Pitcher Point and the abandoned town of Bayocean. The channel to Miami Cove was completed in 1927, the Bayocean dike in 1956, and the small-boat basin of Garibaldi in 1958. The 18-foot channel to Miami Cove is inactive due to a mill closure.
 Channel is 5,000 feet long, 18 feet deep, and has no prescribed width.
 North Jetty is 5,213 feet long.
 South Jetty is 7,094 feet long.

From deep water in the bay to Miami Cove:
 Channel is 3 miles long, 200 feet wide, and 18 feet deep.
 Turning basin is 2,500 feet long, 500 feet wide, and 18 feet deep (currently inactive).

 Small boat basin is 12 feet deep.
 Approach and channel is 12 feet deep.

Bay Ocean Peninsula:
A sand- and rock-filled dike extends 1.4 miles between Pitcher Point and the town of Bay Ocean.
Click here to expand contentClick here to collapse content  Map
Graphic illustration map of Tillamook Bay
The Rivers and Harbors Acts of July 25, 1912, March 2, 1919, March 3, 1925, June 30, 1948, Sept. 3, 1954, and Oct. 27, 1965.