Table 1
5
Isles of Shoals Breakwaters
Isles of Shoals, N.H. and Maine
Construction and Rehabilitation History
Two rubble-mound breakwaters were constructed between Malaga,
1904
Malaga Island to Smuttynose Island and Smuttynose Island to Cedar
Island breakwaters were 150 and 650 ft, respectively,
A 530-ft-long rubble-mound breakwater was constructed between Cedar
1913
Island and Star Island using 34,000 tons of stone at a cost of
,
The Cedar Island to Star Island breakwater was repaired.
A section of the Cedar Island to Star Island breakwater (350 ft long
1955
and adjacent to Star Island) was repaired placing armor stone
weighing 5 to 1 1 + tons and resetting of displaced stone. The design
and
on the sea and
10-ft crown width, and slopes of
harbor sides, respectively. Total cost was ,900 for placing and
resetting 1,640 and 1,140 tons of stone, respectively.
The Cedar Island to Star Island breakwater was inspected and found to
1967
be in poor condition. Plans and specifications were prepared for
repairing a 500-ft section adjacent to Star Island. But, due to
contract bids substantially above the Government estimate, no
contract was awarded. The plans show the breakwater to be approxi-
mately 650 ft long with a 200-ft dogleg section adjacent to Star
.
Existing
to the original length
Island, apparently adding 120
to +13
center-line elevations were typically from
mlw along the
proposed repair section.
About 575
of the Cedar Island to Star Island breakwater, adjacent
to Star Island, were repaired using 6- to 10-ton stone. Prior to
repair, typical center-line elevations varied from
ft
to
mlw. The stone was placed to an elevation and top width of +15 ft
mlw and 20 ft, respectively. Slopes were
and
on the
sea and harbor sides, respectively. In addition to 14,000 tons of
new stone, displaced stone on the harbor side was used in
reconstructing the lower portions of the breakwater. The repair cost
was 5,000.
Visual inspections of the Cedar Island to Star Island and Cedar
1983
Island to Smuttynose Island breakwaters indicate the former was in
good condition, while the latter was in fair to poor condition with a
significant amount of damage along its midsection.
Present conditions of the breakwaters are not known.
1986
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