Table 30 (Concluded)
Construction and Rehabilitation History
Date
The outer 200 ft of the existing west jetty was in fair condition
1984
with an average elevation of
ft mlw, and the average water
(Cont)
depth, seaward of the jetty, was - 20 ft mlw. A scour valley ex-
tended along the toe of the west jetty head and was approximately
50 ft wide and 10 to 12 ft deep seaward of the jetty axis. The east
jetty wing extension was in fair condition with an average elevation
of
ft. The west jetty wing extension was in poor condition
with average elevations of
and -7.5 ft mlw along succes-
sive landward sections of 700, 450, and 400 ft (landward end).
Side
or less
Rehabilitation of
slopes were typically
1,060- and 1,240-ft-long seaward sections of the east and west
jetties, respectively, employed 3 design cross sections (Figure 5 )
ft mlw crown elevation and 5- to
The inner trunk section had a
9-ton cover stone. The outer trunk section had a
mlw crown
elevation and 9- to 12-ton cover stone. Both sections had 15-ft
ft mlw crown eleva-
minimum crown widths. The head section had a
tion, 20-ft minimum crown width, and 12- to 20-ton cover stone. All
sections had
side slopes except the head semicircles, which
(normal to the jetty axis) to
(along
were warped from
the jetty axis). Transition sections (both in geometry and stone
size) between the design sections were 100 ft long, except for the
east jetty inner to outer trunk transition, which was 79 ft long.
lengths of the head, inner trunk, and outer trunk sections on
the east jetty were 100, 301, and 420 ft long, respectively, and on
the west jetty were 100, 300, and 500 ft long, respectively. The
estimated quantity of cover stone was 21,600 tons. The rehabilita-
tion also required removing approximately 150 ft of collapsed steel
sheet-pile wall on the west jetty (beginning 1,000 ft from the sea-
ward end) and breaking up the asphalt layer which covered sections
of both jetties (from the 1938 repairs), into segments no larger
than 20 sq ft, The entrance channel is presently maintained at a
of the jetties taken prior to their rehabilitation.
(Sheet 6 of 6)
92
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