(Continued)
1968-
involved removing existing
to 10-ton cover stone, adding core
1969
stone, and replacing the cover stone. The work was carried out on
to
and
to
(cont.) two sections,
A 1967 survey
of the jetty showed average center-line elevations of
and
ft along the repair areas and remaining jetty, respectively.
Total cost of the repairs was 8,800.
to
The landward end of the east jetty was repaired from
and extended 490
to
1971
The west jetty was repaired
to its landward end at
from
to
from
and
to
Stone size varied from 300 lb to 2 tons,
extended 150
with the largest pieces used as cover stone. The landward extensions
bedding layer of shell material placed prior to the stone.
had a
The design geometry (Figure
had
side slopes, a
ft mlg
crown elevation, a 5-ft crown width on the landward sections, and a
6-ft crown width on the remaining west jetty section. Center-line
elevations of the sections to be repaired averaged
ft mlg for the
west jetty (1968 survey),
ft mlg for the east jetty
survey),
and the natural bottom of the east jetty extension varied from
to
-5.5 ft mlg. The approximate cost of the repairs excluding South
Pass east jetty which also was repaired under the same contract was
using 30,000 tons of stone and 1,000 cu yd of shell
.
material
using 3- to 6-ton
The east jetty was repaired from
to
1972
ft mlg
crown elevation, 5- and 8-ft crown widths shoreward and seaward of
respectively, and
side slopes. An April survey
(before repairs) of the jetty showed an average center-line elevation
within the repair area, and
mlg elsewhere. Cost
of
ft
of the repairs was 9,000 using 36,900 tons of stone.
Two sections of the east jetty were repaired using the 1972 design
1974
Crown widths were ft, from
geometry and stone size (Figure
and 8 ft from
to
to
Cost of the re-
pairs was
||content||
,399,000 using 64,500 tons of stone. Figure 15 is a
photograph taken in February showing three dredges operating between
the jetties and a grounded vessel near the seaward end.
The east jetty was repaired with 3- to 6-ton stone at locations
1975
(seaward end). The design geo-
to
and
to
side
had an elevation of
ft mlg,
metry (Figure
slopes, and an 8-ft-wide crown (except from
to
which
was 5 ft wide). After repairs were completed, it was noted that
additional stone between
and
would be needed to stabi-
lize the gulf side slope because some of the new slope stones were
removed during periods of heavy wave action. The total cost was
,306,800, and 103,660 tons of stone were required.
(Continued)
33
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