Table 7 



Humboldt Harbor 



Sand Point. Alaska 



Date(s) Construction and Rehabilitation History 



1970 The project was adopted. 



1975- The project was constructed, including a l6.6-acre mooring basin 

 1976 protected by two rubble-mound breakwaters and a rubble-mound diver- 

 sion dike. The 1,025-ft north breakwater was constructed to a crest 

 elevation of +15 ft mllw, crest width of 6 ft, and side slopes of 

 1:1.5 on the basin side and 1:2 on the seaward side. The 740-ft 

 south breakwater was of similar construction but with a crest eleva- 

 tion of +13 ft mllw. The breakwaters were constructed of core mate- 

 rial covered with a 4.5-ft layer of secondary armor rock (50 to 

 500 lb, 130-lb average) or a 2-ft layer of secondary armor rock under 

 a 4-ft layer of primary armor rock (1,000 to 4,000 lb, 1,300-lb aver- 

 age). The primary armor covered the seaward side of the breakwaters 

 and 150 ft from the heads on the basin sides to -13 ft mllw. It 

 also covered the remainder of the basin sides to -3.5 ft mllw. The 

 1,175-ft diversion dike was constructed to a crest elevation of 

 +12 ft mllw, crest width of 8 ft, and 1:2 side slopes. The core 

 material was covered with a 1-ft filter layer and a 3-ft layer of 

 quarry spalls. The entrance channel was dredged to -18 ft mllw with 

 a minimum width of 120 ft. 



1985 The harbor is illustrated in Figure 19, and an aerial photograph of 



the harbor is presented in Figure 20. There are no reports of needed 

 repairs or rehabilitation. 



61 



