Table 1
6
Hampton Harbor Jetties
Hampton Harbor, N.H.
Date(
Construction and Rehabilitation History
Two stone jetties were constructed by the New Hampshire State Highway
1935
Department to lengths of 1,300 and 1,000 on the north and south
sides of Hampton Harbor Inlet, respectively.
1966
The Federal government extended the north jetty seaward 1,000 ft,
repaired the outer 300
of south jetty, and constructed a 180-ft-
long landward-perpendicular spur at the inner end of the south jetty
repairs (Figure
Crown elevations of the north and south jetties
were +12 and +16
mlw, respectively. Crown width and side slopes
were 5 ft and
respectively. The jetty section was built
with a 1.5-ft-thick bedding layer of 1- to 50-lb stone, a core of
to 300-lb stone, a 2-ft-thick underlayer of 400-to 1,000-lb stone,
and a cover layer of 2- to
stone. The 150-ft seaward section
of the north jetty had a 7-ft crown width and a cover layer of 3- to
4-ton stone, The north jetty head semicircle had a
side
slope. The bedding layer extended 5
beyond the cover layer toe.
A constructed, the crown consisted of a single row of cap stones.
s
The cost for placing 36,670 tons of stone was 2,400.
Plans and specifications were prepared for north jetty repairs, but
1969
no work was done at this time. The outer 1 0
was in an unraveled
1
condition with typical center-line elevations from
to
mlw.
The north jetty extension was repaired. Prior to repair, the jetty
1973
had numerous void spaces and gaps along its entire length. The
1974
seaward 300 ft was in a severely unraveled state with typical crest
mlw. The seaward
ft was brought
elevations between 0 and
up to +12 ft mlw with 6- to 9-ton stone placed to an 8- to 10-ft
crown width and
side slopes. The jetty head semicircle had a
side slope. The landward 55 ft was rebuilt to the 1966 design
geometry with 2- to 3-ton stone. Void areas on the remaining jetty
section were repaired with 2- to 3-ton stone. A total of 8,380 tons
of stone was placed at a cost of 5,400.
Repairs to the north jetty consisted of placing 4- to 9-ton stone on
18
91
a 535-ft section at its seaward end. The design geometry was
to +12 ft mlw
the repairs, typical crown elevations varied from
with most of the subsidence ocurring at the seaward end of the repair
section. A total of 1,290 tons of stone was placed at a cost of
9,905.
1984
The jetties were inspected and found to be in excellent condition.
is an aerial photograph of the jetties taken on 1 October
6
Figure
1984.
37
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