Table 42 



Duck Island Harbor Breakwaters 



Duck Island Harbor, Conn. 



Date(s) Construction and Rehabilitation History 



1891- Three rubble-mound breakwaters were constructed; one north from Duck 

 1915 Island (1,100 ft long), one west from Duck Island (2,697 ft long), 

 and one south from Stone Island (3,750 ft long) (Figure 46). The 

 breakwaters provide protection for the 16-ft-deep anchorage area 

 behind Duck Island. The Duck Island breakwaters were built to a 

 crown elevation of +9 ft mlw, an 8-ft crown width, and side slopes of 

 1V:1.5H and 1 V: 1H on the sea and harbor sides, respectively. The 

 Kelsey (Stone Island) breakwater differed only in using 1V:1.5H side 

 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 

 the west breakwater in 1905, 1909, and 1915 using a total of about 

 10,000 tons of stone. The Kelsey breakwater was also repaired in 

 1915 using 460 tons of stone. 



1939 Repairs were made to the west and Kelsey breakwaters using 4,500 tons 

 of stone for a total cost of $25,600. 



1962- Visual inspections showed the Duck Island breakwaters were in good 

 1977 condition while the Kelsey breakwater was rated from poor to good 

 condition at various times. Subsequent repairs were performed. 



1985 Yearly visual inspection of the structures revealed they were in good 

 condition. 



1986 Field surveys indicated the breakwaters were found to be in good 

 condition. 



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