constructed in 1926. A 600- by 400-ft basin dredged to -10 ft mllw (outer
basin) was authorized in 1935 and dredged in 1936. An inner basin, 550 ft
mllw), a connecting channel, and a
wide (dredged to -10
long by 325
320-ft breakwater were authorized in 1945. The basin and connecting channel
were dredged during 1956 t o 1957; the 320-ft breakwater was deferred. A
chronology of events related to the development and repair of the harbor
structures is given in Table 20.
Portland District
Chetco River, Oregon
62. The mouth of the Chetco River i located on the southern Oregon
s
coast, about miles north of the Oregon-California border. The Town of
Brookings, Oregon, i situated along the mouth of the river.
s
63. Authorized in 1945, the original project included an 850-ft north
jetty and a 1,550-ft south jetty, both completed in 1957; and removal of rock
pinnacles and abandoned bridge piers was completed in 1959. In 1962, the
outer 440 feet of the south jetty was repaired and raised. The project was
modified in 1965 to include a 450-ft extension to the north jetty and to raise
the rest of the north jetty to +16 ft mllw (completed in 1 6 ) Construction
98.
of a 1,800-ft protective dike to +18
mllw was completed in 1970. Exten-
sions of both jetties and deepening of the channel were recommended in 1977
(the General Design Memorandum having been initiated in
but funds have
not yet been made available. A chronology of events related to the develop-
ment and repair of the jetty structures is given in Table 21.
Columbia River at
Mouth, Oregon and Washington
64. The Columbia River is the largest river on the Pacific coast of
259,000 sq. miles. Extensive and shifting shoals, known as Clatsop Spit,
extended north and west from Point Adams on the south side of the river mouth,
making navigation into the river hazardous. On the north side of the mouth is
Cape Disappointment, about 6 miles north-northwest from Point Adams. Shoals
off the southern end of Cape Disappointment are known as Peacock Spit. The
ocean bar connects Peacock Spit and Clatsop Spit.
65. In 1882, Congress authorized a board of engineers to develop a plan
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