Table 9 

 Ketchikan Harbor 

 Ketchikan. Alaska 



Date(s) Construction and Rehabilitation History 



Thomas Basin 

 1930 The project was adopted. 



1932 The project was completed, including dredging an 11.35-acre basin to 

 -10 ft mllw and constructing a 940-ft stone breakwater to an eleva- 

 tion of +20 ft mllw with a 4-ft crest width and 1:1.5 side slopes. 



1933 A concrete cap, 840 ft long, was placed on the breakwater crest. The 

 cap was 3 ft high, 1.5 ft wide at the top, and 4 ft wide at the 

 bottom. Breakwater cross sections are shown in Figure 24. 



1939 The breakwater was repaired. 



1977 The concrete parapet on the breakwater was rehabilitated. 



1985 The harbor is illustrated in Figure 24, and an aerial photograph of 

 the harbor is presented in Figure 25. There have been no reports of 

 needed repairs or rehabilitation since 1977. 



Bar Point Basin 



1954 The project was authorized, including an 11,9-acre basin and con- 

 struction of three breakwaters of lengths 700 ft, 1,100 ft, and 

 450 ft, all of rubble-mound construction with concrete gravity walls 

 on top. During the design stage, the concrete gravity walls were 

 deleted and the rubble-mounds were raised. 



1958 The project was completed with the exception of the 450-ft break- 

 water, which was deferred for restudy. The breakwaters were con- 

 structed of a core of dredged material covered by quarry rock and 

 armor rock to a crest elevation of +23 ft mllw, a crest width of 

 4 ft, and side slopes of 1:1.5. Armor rock weighed 900 to 2,000 lb, 

 and the quarry-run rock weighed less than 2,000 lb with 75 percent of 

 the rock greater than 6 in. The project required 133,000 cu yd of 

 dredged material, 59,900 cu yd of quarry rock, and 21,530 cu yd of 

 armor rock. Breakwater cross sections are shown in Figure 24. 



1979 The 450-ft breakwater was deauthorized, and construction was 

 initiated on the floating breakwaters. 



1980 The harbor was expanded by 25 acres with the completion of two 

 floating breakwaters, 963 and 120 ft long. The breakwaters were 

 built in the catamaran "Alaskan" style of units that were 40 ft long, 



(Continued) 

 69 



