Table 105 



Oswego Harbor Breakwaters 



Oswego, New York 



Date(s) Construction and Rehabilitation History 



1882 Construction of a 4,515-f t-long west breakwater (Figure 292, Sec- 

 tions C and D) was completed. The structures consisted of stone- 

 filled timber cribs with widths of 35 ft (Figure 293, Sections C 

 and D) . 



1931- Construction of a stone and concrete superstructure (Figures 292 and 

 1932 293, Sections C and D) was completed on the existing timber crib 



structures. A 2, 700-f t-long west arrowhead and a 2, 200-f t-long east 

 arrowhead breakwater (Figure 292, Sections A and B) were also 

 constructed. The arrowheads were rubble-mound structures with crest 

 els of +8.5 ft Iwd and widths of 10 ft. Side slopes were 1V:1.5H on 

 the lakeside and 1V:1.3H on the harbor side (Figure 293, Sections A 

 and B) . Armor stones weighing 3 tons (minimum) with not less than 

 60 percent of 6 tons or more were used. 



1942 Stone was placed along the lakeside of the timber crib west break- 

 water (Figures 292 and 293, Sections C and D) . A slope of IV: 2H was 

 used, and the el at the top of the slope ranged from 6 to 6.5 ft Iwd. 

 Cover stone weighed from 3 to 5 tons each. 



1958- Construction of an 850-ft-long detached rubble-mound breakwater 

 1959 (Figure 292) was completed. The crest el of the structure was +10 ft 

 Iwd, and its width was 8 ft. Slopes on the lakeside were 1V:1.5H, 

 and on the harbor side they were 1V:1.3H (Figure 293). Cover stones 

 weighed 7 tons each. This breakwater was model tested prior to 

 construction (Fortson et al 1949) . 



1962 Rehabilitation of the west breakwater (Figures 292 and 293, Sec- 

 tions C and D) was completed. Repairs consisted of replacement of 

 lost stone on the lake slope, placement of riprap stone on the harbor 

 side, and replacement of portions on the concrete superstructure 

 (over cracked and displaced sections) . The weight of the cover stone 

 used on the harbor side ranged from 1 to 3 tons. 



1983- Rehabilitation of the breakwaters was performed. The timber crib 

 1984 structure was replenished with stone fill, and the concrete cap was 

 repaired in various areas. Riprap on the lakeside and harbor side 

 was replaced as needed. Missing armor stones on the rubble-mound 

 sections of the breakwater were replaced as needed. 



1986 The breakwaters presently are considered to be in very good condi- 

 tion. Minor repair work has been noted and will be accomplished 

 during routine maintenance operations. An aerial view of the Oswego 

 Harbor breakwater at the harbor entrance is shown in Figure 294. 



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