Table 30 (Continued)
Construction and Rehabilitation History
mlw crown elevation, a 2-ft crown width, and
slopes. (The cap stone was 4 to 8 tons, and the core stone was
25 to 2,000
The total cost of the extensions was ,100.
An inspection of the jetties indicated that the seaward end of the
west jetty had undergone some settlement. On the east jetty a low
saddle allowed waves to overtop the structure, and subsequent ero-
sion on the landward side threatened to create a continuous channel
from Gulf to Bay. In addition, low sections on the jetty extensions
allowed incoming waves to overtop them, with continued erosion of
the shoreline behind the extensions. It was concluded that, as ori-
ginally constructed (800
the jetties were spaced too far apart
(1,500 f )
t . For this reason, wave attack on the shore landward of
the jetty wings was severe, and the shoreline receded rapidly which
in turn required extensions of the jetties to halt the erosion and
the potential for flanking of the jetties.
Repair work and landward extensions of 300 and 360 ft on the east
and west jetty wings, respectively, were made at a total cost of
3,000. The design cross section was identical to that of the
1942 extension. Also, Congress authorized a 34-ft-deep (5 ft
deeper) by 450-ft-wide channel between the jetties (this depth was
being maintained as early as 1956).
Repairs were made to the jetties with 1,980 tons of stone placed at
a cost of ,000.
The west jetty extended approximately 600 ft on its landward end
with 410 and 7,330 tons of riprap and cover stone, respectively, at
a total cost of ,300. At this time the cumulative lengths of
the east and west jetties were approximately 2,000 and 2,750 ft,
Minor repairs consisted of placing 631 tons of stone, and 960 tons
of stone were stockpiled. Total cost was ,300.
Repairs were made by placing 7,270 and 13,500 tons of stone along
the landward sides of the east and west jetty wings, respectively.
The repair section (Figure 49) was to have a crest elevation of
ft mlw, a crest width of 4 to 10 ft, and a
size was placed on the inner 1,235 ft of
to 8-ton capstone was placed along an adja-
the west jetty, and
cent 430-ft section and on the inner 1,025-ft of the east jetty.
to 12-ft wave
The design was based on Hudson's equation and
A 2-ft foundation blanket of
to 1,000-lb core stone.
placed and overlaid on the capstone and
(Sheet 3 of 6)