Table 33
Sakonnet Harbor Breakwater
Sakonnet Harbor, R.I.
Construction and Rehabilitation History
Two hundred feet of the proposed 400-ft-long rubble-mound breakwater
1836
The breakwater was extended 200
seaward to its authorized length
of 400 ft. A total of 18,400 tons of stone was placed in the ex-
1901
tension at a total cost of ,000.
The breakwater was repaired using 1,120 tons of stone at a total cost
1939
of ,800.
seaward (Figure 37, aerial photo-
The breakwater was extended 400
1957
graph), and approximately 800 tons of stone were placed at its land-
ward end. The extension and repair sections were constructed with
0.5- to 6-ton stone placed to an elevation of
ft mlw, a 15-ft
on the sea and harbor
crown width, and slopes of
and
side slope was also used on the head
sides, respectively. A
semicircle. The extension was made in water depths varying
-15 to -21 ft mlw. The 150-ft landward repair section included the
landward 50 ft of breakwater. The contract cost for placing an
tons of stone was 9,500. The remainder of the
estimated
breakwater was in good condition with center-line elevations of
to
ft mlw, typical.
June topographic survey shows cross sections for the entire
A
1960
above the design cross section used in
breakwater approximately 2
1957. The reason for the apparent change in datum could not be found
(for present report purposes).
Repairs were made on three sections totaling 86 lin ft, including a
1961
25-ft section at the seaward end and 9- and 52-ft sections located
approximately 140 and 430
from the seaward end, respectively. The
repairs were made with 0.25- to 5-ton stone placed to an elevation of
ft mlw, a 15-ft crown width, and slopes of
and
on the
sea and harbor sides, respectively. Except for the outermost 15 ft
of repairs, which appears to have subsided prior to June 1960, the
repair areas were apparently damaged by storm waves sometime between
the June 1960 survey and a visual inspection in February. The
damaged areas had typically subsided from 3 to 5 ft. The contract
cost for placing an estimated 1,200 tons of stone was ,400.
Minor harbor-side slope repairs were made near the landward end of
the breakwater. The new riprap was placed for a total cost of
1972
00. The overall condition of the breakwater was good, except for
some seaside slope stone slippage.
(Continued)
72
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