Table 30 (Continued)
Date
Construction and Rehabilitation History
1966
land side. The berms were identical in design to the 1963 berm.
(Cont)
The cover stone was placed to
ft mlw, a 15-ft minimum crown
side slopes. A total of 13,160 tons of stone was
width, and
placed at a cost of 5,700. The repairs were required to prevent
further deterioration of the structure and eliminate the need for
more costly repairs in the future. The erosion at the toe of the
jetty had been most severe on the channel side, and the resulting
settlement had caused a split in the jetty along the sheet-pile core
wall. The combination of settlement and wave attack had lowered
sections on the channel side to
mlw. The outer 100 ft of the
ft mlw
jetty was seriously deteriorated with top elevations from
to below mlw. The next 200 ft at the seaward end had considerable
displacement of cover stone and exposed portions of core stone. The
outer 1 0 ft of the jetty was not repaired because (a) it would be
0
it would act as a berm and prevent
expensive to repair, and
undermining of the repaired outer
The design wave height of
21 ft was based on a
ft mlw surge level, a water depth of 21 ft,
and depth-limiting conditions. Although several methods were used
to compute cover stone size, these were used as a rough guide; and
the size was determined from a number of practical considerations.
1968
The west jetty extension was rehabilitated during the summer at a
cost of ,100 (no details available).
1973
The 2,025-ft-long east jetty, rehabilitated with cover stone and
berm stone (toe apron), was placed along portions of the channel
side. In many respects, this work was similar to the 1966 west
jetty repairs. On the inner 1,525 ft 6- to 8-ton cover stone was
placed, and on the seaward 500 ft 8- to 12-ton cover was placed.
ft mlw, crest
The design section called for a crest elevation of
widths of 9 and 15 ft on the landward and seaward sections, respec-
tively, and
side slopes. Berm stone was placed along the
inner 950 ft and placed in a semicircle around the jetty head. Berm
stone was also placed on two sections, one section extending 100 ft
seaward from the jetty hook and the other section 50 ft long, start-
ing 1 0 ft landward of the jetty hook. The berm design section was
0
similar to the 1966 berm except for a specified thickness of 3 to
5 ft. The cost of repairs was 2,200.
The jetties were surveyed during the summer of 1983 to determine
1984
existing conditions prior to their rehabilitation in 1984. The
trunk sections of both jetties were in good condition with average
ft mlw. The outer 150 ft of the east
centerline elevations of
jetty was in poor condition with an average elevation of
ft mlw,
and the average water depth, seaward of the jetty, was -15 ft mlw.
(Continued)
(Sheet 5 of 6)
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