Construction and Rehabilitation History
of east jetty was capped with concrete and
1952
About 2,300 lin
13,360 tons of stone placed at a total cost of 1,500. The cap
landward of the 1939 cap section and
section was placed
was 6 ft wide with a top elevation of
ft mlg. Stone was placed
along the cap section and extended an additional 200 ft landward.
1955
Repairs to the west jetty consisted of a 1,125-ft-long rubble-mound
jetty at the seaward end (Figure 9) built on the seaside of, and ex-
seaward of, the existing bulkhead; and construction of
tending 350
930 ft of stone dikes,
of fascine dikes, and 1 0 ft of
8
pile weir, all on a 3,600-ft-long section landward of the
mound section. Most of the rubble-mound structure was built on
ballasted with 25- to 200-lb stone (60 lb/
to 70-ft-wide fascine
per sq ft). A 300-ft section, at its landward end, was built on a
ft-thick layer of similar sized stone. The design cross section had
crown elevation, crown widths of 5 ft (landward 300 ft)
a
and 8 ft, and
side slopes. The landward 300 ft was built up
using 200- to 2,000-lb stone, and the seaward 300
had a cover
layer of 5- to 10-ton stone. The jetty midsection and seaward core
stone was 200
to tons. Existing water depths varied from -2 to
-20 ft mlg at the landward and seaward ends, respectively. The total
cost of the jetty was 4,200 using 41,500 sq
of mattress and
tons of stone. The steel sheet-pile weir was placed to an
elevation of -3 ft mlg along a 100-ft section with an elevation of
ft mlg on adjacent 40-ft sections. A total of 1,040 tons of stone
was placed along the weir length. A total of 11,270 and 850 tons of
stone was placed on the stone and fascine dike sections, respec-
tively. The total cost for the dikes and weir was 5,100.
Repairs were made to 590 ft of the east jetty and to 1 0 ft of the
1
1957
west jetty outlet weir built in 1955. A total of 350 tons of stone
was placed at several locations on the west jetty. The east jetty
work, at the existing landward end (total jetty length, including
present work, now 8,930 ft), consisted of 1 0 ft of rubble-mound
0
weir, 390 ft of rubble-mound jetty on the existing structure, and
of new rubble-mound jetty. The weir design section had a 4-ft
10
0
side slopes on the
crown width at -2
mlg and
and
channel and seasides, respectively. The jetty design section had a
side slopes. The stone
5-ft crown width at
mlg and
size varied from 200 to 4,000 lb with the largest pieces placed in a
2.5-ft-thick cover layer. The sea side of the west jetty weir
section had 5- to 75-lb riprap placed at a
side slope beginning
1 ft from the steel sheet pile. This riprap was covered with a
0
ft-thick layer of 75- to 500-lb stone. Total cost for this work and
repairs to Southwest Pass jetties was 9,400.
The east jetty concrete cap was buttressed with stone (Figure 1 )
1966
along 3,800- and 6,700-ft-long sections on the sea and channel sides,
(Continued)
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