Table 8 

 Juneau Harbor 

 Juneau, Alaska 



Date(s) Construction and Rehabilitation History 



Harris Basin 



1937 The project was adopted. 



1938- The breakwaters were constructed. The 430-ft south breakwater was 

 1939 constructed as a rock mound to elevation +24 ft mllw, crest width of 

 8 ft, and 1:1.5 side slopes. The 1,540-ft north breakwater was con- 

 structed to an elevation of +26 ft mllw, a crest width of 8 ft, and 

 side slopes of 1:1.5. The north breakwater was constructed of rubble 

 mound covered with a 2-ft-thick layer of Class "A" armor rock on the 

 crest and on the channel side to elevation -10 ft mllw. The break- 

 waters required 77,349 cu yd of rock. Breakwater cross sections are 

 given in Figure 21 . 



1939 An 11.5-acre basin was dredged to -12 ft mllw. 



1973 The north breakwater was repaired by reshaping and placing armor 

 stone. 



1985 The harbor is illustrated in Figure 21, and an aerial photograph of 

 the harbor is presented in Figure 22. There have been no reports of 

 needed repairs or rehabilitation since 1973. 



Aurora Basin 



1958 The project was adopted, including a 19-acre basin protected by a 



530-ft jetty and a 1,150-ft breakwater. During the design stage, the 

 jetty and breakwater were lengthened to 670 ft and 1,500 ft, respec- 

 tively. The breakwater was originally designed as a rubble mound, 

 but the design was changed to a composite rubble-mound plank and 

 piling breakwater due to unstable soil conditions. 



1962 The jetty was constructed of rubble mound to elevation +24 ft mllw, 

 with a crest width of 4 ft, and side slopes of 1:1.5. The jetty 

 required 24,000 tons of rock. Jetty cross sections are shown in 

 Figure 21 . 



1962- The 19-acre basin was dredged, 13.1 acres to -12 ft mllw and 



1963 5.9 acres to -14 ft mllw. 



1963- The main breakwater was constructed of a rubble mound to elevation 



1964 +12 ft mllw and steel pilings with treated planks to elevation +24 ft 

 mllw. The rubble mound included a dredged material blanket 90 ft 

 wide and 1,500 ft long, a core of dredged material to elevation 



(Continued) 

 64 



