Table 23
Plymouth Harbor Breakwater
Plymouth, Mass,
Construction and Rehabilitation History
1968-
A rubble-mound breakwater, with east and west legs 2,100 and 1,400ft
1971
long, respectively, was constructed providing protection to
reational and commercial vessels using Plymouth Harbor (Figure 26,
plan view). The design crown elevation was +15 ft mlw, but to allow
for foundation settlement the construction elevations were +16 and
ft mlw on the east and west legs, respectively. The crown
width was 7 ft, and side slopes were
The breakwater cross-
section was made up of 2-ft-thick bedding layer of 0- to 12-in.
stone, followed by a core of 0- to
stone, and the 3-ft-thick
outer layer required stone weighing a minimum of 600
and 2 tons on
the side slopes and crown, respectively. The stone size was based on
Hudson's slope stability formula and a design wave height of 3.5 ft,
and the crown elevation was based on a design tide of
ft mlw.
The contract price for breakwater construction, using an estimated
total of
tons of stone, was
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,145,100.
Inspections during this period showed the breakwater was in excellent
1972-
1978
condition.
1982-
Visual inspections of the breakwater indicated it was in good
1984
condition.
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