Table 7
Humboldt Harbor
Sand Point, Alaska
Date(
Construction and Rehabilitation History
1970
The project was adopted.
1975-
The project was constructed, including a 16.6-acre mooring basin
1976
protected by two rubble-mound breakwaters and a rubble-mound
dike. The 1,025-ft north breakwater was constructed to a crest
ft mllw, crest width of 6 ft, and side slopes of
elevation of
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
filter layer and a 3-ft layer of
material was covered with a
quarry spalls. The entrance channel was dredged to -18 ft mllw with
a minimum width of 1 0 ft.
2
1985
the harbor i presented in Figure 20. There are no reports of needed
s
repairs or rehabilitation.
6
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