Table 31
Manasquan Inlet Jetties
Manasquan, New Jersey
Philadelphia District
Construction and Rehabilitation History
1882
timber jetty and dike was constructed north of the
A
inlet.
1883
A timber jetty was constructed south of the inlet to a length of
approximately 500 ft.
1886
The south jetty was flanked, and use of the inlet was seriously
impaired.
New timber jetties were constructed.
1922
The jetties were in a state of disrepair.
1924
Two rubble-mound jetties were constructed north and south of the
inlet to replace the timber jetties and provide channel protection.
1931
The north jetty was 1,230 ft long, and the south jetty was 1,030
long. The jetties were spaced 400
apart and built to an elevation
of +14
mlw, with a 12.0-ft crown width and side slopes of
on the channel side (Figure 38). Cap-
on the ocean side, and
stone was 2.0 ton, and core stone ranged from 100 to 500
Both jetties were rehabilitated using 5,190 tons of capstone,
1946
2,886 tons of corestone, and 628 cu yd of grout. The cost of
rehabilitation was ,778.
The north Jetty was rehabilitated using 5,400 tons of stone at a cost
1955
of 8,597.
The south jetty was rehabilitated using 12.0-ton capstone at a cost
1959
of ,048.
The seaward 100 ft and 60 ft of the north and south jetties, respec-
1977
tively, were destroyed through continued displacement of armor stone
and loss of structural integrity. The south jetty was damaged from
the seaward end to 700 ft shoreward. Sand passed from the south
jetty fillet through and over the jetty into the inlet.
Both jetties were rehabilitated using dolosse. Sand and displaced
1979-
1982
stone were excavated and reshaped to design configuration before
dolosse placement. Sixteen-ton dolosse were placed along the seaward
4 0 ft on the north side of the south jetty, around the jetty head,
0
and along the seaward 50 ft on the south side. The dolosse extended
to -10 ft mlw on the channel side, with side slopes of
and
The seaward 400 ft was concrete capped, 20
front slopes of
wide, and was built at an elevation of +14
mlw. Sixteen-ton
dolosse were placed along the seaward 250 ft on the north side of the
on
north jetty, around the jetty head, and along the seaward
(Continued)
65
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