Table 27
Nantucket Harbor Jetties
Nantucket Island, Mass.
Date(
Construction and Rehabilitation History
The east and west rubble-mound jetties were constructed to lengths of
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6,987 and 4,955 ft, respectively. The jetties converged to a
1907
distance of approximately 1,000 ft, with the east jetty extending
mlw, side slopes
and crown
elevations were typically
widths and 6 ft on the west and east jetties, respectively.
Approximately 63,000 and 59,000 tons of stone were used in the east
and west jetties, respectively.
The outer end of the east jetty was reconstructed for the purpose of
1917
mounting a navigation light. A total of 1,790 tons of stone was used
for a total cost of ,300.
of its
East jetty repairs were made on all but the outer 300
1926
length. The total repair cost was ,600.
East jetty repairs were made using 15,900 tons of stone at a total
cost of ,900.
1937
of the east jetty was rehabilitated. The repair
About 4,400 lin
The
sections were located from
to
and from
to
1963
The design crown
jetty's seaward end was at approximately
width and side slopes were 6 ft and
respectively. The land-
ft mlw, respec-
and
ward and seaward sections were raised to
tively. Minimum stone size was 1.5 tons, with 75 percent of the
total stone quantity in pieces weighing a minimum of 2 tons. Prior
to repairs, the seaward section had typical crown elevations between
and -2 ft mlw. The repairs required 15,100 tons of stone for a
total cost of 1,000.
Visual inspections indicated the east jetty was in fair condition
with some displacement of stone noted. The west jetty was in poor
1977
condition, with most of the structure below mhw (+3
rl)
nw.
Yearly visual inspections indicated the jetties were in good
1981
condition.
Present conditions of the jetties are not known.
1986
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