Construction and Rehabilitation History
ft mlw and side slopes of
and
above and below mlw,
1928
respectively (50 percent of stone was to be greater than 7 tons).
(Cont)
Cumulative stone quantities placed during this time were about
340,000 tons on the north jetty and 116,500 tons on the south jetty.
Costs since 1895 for new work and maintenance were
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,369,000 and
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,501,000 for the north and south jetties, respectively.
A centerline survey of the jetties showed that nearly the entire
1929
north jetty and the outer 7,000 ft of the south jetty had an
ft mlw. The crest elevation of
approximate crest elevation of
the inner 4,000 ft of the south jetty varied from 0 to
ft mlw.
The outer ends of the jetties converged to a distance of 1,600 ft
then ran parallel to each other for a distance of 4,000 ft. The
water depth at the seaward toes was approximately -20 ft mlw.
Repairs were made between sta
and
of the north jetty
1930
to
ft mlw were raised to
ft mlw. The
average height of
crest elevations on the outer 500 ft of the jetty were from -5 to
and
- 15 ft mlw. The south jetty was repaired between sta
to
ft mlw were raised to
ft mlw.
with average heights of
The crest elevations on the outer 700 ft of the jetty were from
to -10 ft mlw. The stone size was from 4 to 10 tons with an
average size of 6 to 8 tons. The crown width was 10 ft, and the
Cost of the repairs totaled 8,000.
side slopes were
ft mlw on the ocean side of the south jetty were
Voids below
filled with 25- to 100-lb granite stone to stop the flow of sand
1932
through the structure, and 3,450 tons of stone were placed between
and
sta
tion
ft
constructed of 550 tons of stone was placed at
on the ocean side of the south jetty to stop the flow of
sta
water along the jetty. Later, a head section on the groin was con-
structed using 245 tons of granite and 50 cu yd of oyster shell.
Total cost of the groin was ,300. The seaward ends of the
jetties were repaired (Figure
the north between sta
and
and the south between sta
and
Storm waves had,
over time, lowered both jetties and created gaps, necessitating the
to
repairs. Gaps (low points) on the jetties ranged from
ft mlw. The outer 500 ft of the north jetty ranged from -5 to
-20 ft mlw, and the outer 700 ft of the south jetty ranged from
to - 1 2 ft mlw. The armor stone ranged from 8 to 14 tons, and the
design section consisted of a 10-ft crest width at
ft mlw and
side 'slopes.
(Continued)
(Sheet 2 of 4)
44
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