Table 7
Grand Isle Jetty
Jefferson Parish, Louisiana
!
Date
Construction and Rehabilitation History
jetty was constructed by the Louisiana Department of Public Works
approximately 1,000
west of the eastern end of Grand Isle. The
jetty was approximately
long. It was founded on a timber
mattress and had a 6-ft crown width with
on
side slopes.
1964
The jetty was extended 1,400
by the State of Louisiana with
essentially the same cross section used for initial construction.
1966
The jetty at the east end of Grand Isle (west side of Barataria Pass)
elevations (October 1965 survey) varied from -8.5 to
ft mean sea
level (msl). The repairs were carried out along 2,320 ft of the
(seaward end). The landward end of the
jetty from
to
repair section was approximately 200 ft from the existing shoreline.
msl crown elevation
(+4 ft msl on landward 340 ft), a 6-ft crown width, and
side
slopes. A bedding layer of shell was placed at two sections,
A total of 7,500 tons of 500-lb to
to
and
to
cu yd of shell was placed at a total cost of
ton stone and
,500. After the jetty repairs, the State of Louisiana placed
ft of sand dike between the existing shoreline and the
about 200
landward end of the jetty. The dike was to have a crest elevation of
ft, and additional shell and 25- to 1,000-lb stone were to be used
at the jetty junction. The cost for the dike was to be reimbursed by
the Federal government (no details).
A jetty was constructed at the west end of Grand Isle.
1972
1985
Additional information on the jetty was not found, and its present
condition is unknown.
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