Table 42
Duck Island Harbor Breakwaters
Duck Island Harbor, Conn.
Construction and Rehabilitation History
Three rubble-mound breakwaters were constructed; one north from Duck
Island (1,100 long), one west from Duck Island (2,697ft long),
1915
and one south from Stone Island (3,750 ft long) (Figure 4 ) The
6.
breakwaters provide protection for the 16-ft-deep anchorage area
behind Duck Island. The Duck Island breakwaters were built to a
crown elevation of
ft mlw, an 8-ft crown width, and side slopes of
and
on the sea and harbor sides, respectively. The
side
Kelsey (Stone Island) breakwater differed only in using
slopes throughout the cross section. The total stone quantities
placed in the north, west, and Kelsey breakwaters were 23,100,
139,800,and 244,400 tons, respectively. Minor repairs were made to
and 1915 using a total of about
the west breakwater in 1905,
10,000 tons of stone. The Kelsey breakwater was also repaired in
1915 using 460 tons of stone.
Repairs were made to the west and Kelsey breakwaters using 4,500 tons
1939
of stone for a total cost of ,600.
Visual inspections showed the Duck Island breakwaters were in good
condition while the Kelsey breakwater was rated from poor to good
1977
condition at various times. Subsequent repairs were performed.
Yearly visual inspection of the structures revealed they were in good
1985
condition.
1986
Field surveys indicated the breakwaters were found to be in good
condition.
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