Table 2
1
Chetco River
Brookings, Oregon
Date(
Construction and Rehabilitation History
The jetties were completed. The north jetty was 850
1957
long, and the
south jetty was 1,550 ft long. The jetties converged to 325 ft apart
at the outer ends.
Rock pinnacles and abandoned bridge piers were removed,
1959
The outer 440 ft of the south jetty was repaired and raised to pre-
1962
vent movement of sand and drift into the navigation channel. Select
stone was used on the outer 1 0 ft. The rest of the repair
class
1
work placed a 5-ft layer of class
stone over a core of class
stone. Select class
stones weighed more than 12 tons, class
stone weighed a minimum of 6 tons and averaged 1 tons, and class
0
stone weighed between 1 and 6 tons and averaged tons.
1968
The north jetty was raised to +16
mllw and extended 450 ft. The
work required an estimated 61,900 tons of class
and
stone and 14,800 tons of bedding material. Class
stone was
of the jetty to +16 ft mllw. An
placed to raise the inner 800
stone was placed over a core of class
armor layer of class
stone on the outer portion of the jetty. The final 50 ft of
and
the jetty was composed entirely of select class
stone. Based on
a unit weight of 160 pcf, select class
stone weighed a minimum of
stone weighed a minimum of 8 1 tons and averaged
.
11.6 tons; class
tons, placed in a 10-ft-thick armor layer; and class
stone
weighed a minimum of 5.2 tons, averaged 6.7 tons, and was placed in a
layer with a minimum thickness of ft. The rock was placed by a
crane on the jetty.
A protective dike was constructed to protect the small-boat basin
1970
about 2,500 ft upriver from the jetties. The dike, 1,781 ft long by
1 ft high, was constructed of a gravel embankment covered with a
8
riprap revetment of 12-in. quarry spalls on the river side.
An extension of the north jetty by 750
and the south jetty by
1977
1,250 ft was recommended.
1985
have been no reports of repairs or rehabilitation since
111
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