sist mainly of harbors protected by breakwaters and are unique among the dis-
tricts in the division in three ways. First, while the harbors in southeast-
ern Alaska were economically justified for their support of the
and
sport fishing fleets, the harbors in southwestern Alaska have the additional
only harbors in the division where ice is a problem. Valdez Harbor is gener-
ally considered the northernmost ice-free port in Alaska.
10. The third unique problem of NPA was a major earthquake in 1964
which destroyed or damaged several Corps projects. Cordova Harbor was up-
Kodiak Harbor subsided 5 ft; Seldovia Harbor subsided 3 . 8 ft;
lifted 6 . 4
and the harbors at Homer, Seward, and Valdez were completely destroyed. The
harbors at Kodiak and Seldovia were rebuilt; Cordova Harbor was rebuilt and
expanded; and the harbors at Homer, Seward, and Valdez were all relocated,
expanded, and rebuilt. In addition, the town and harbor of Port Lions were
established when the government relocated the inhabitants of the town of
Afognak, which was destroyed by the earthquake.
1 1 . The five jetties maintained by NPA are small, with the largest,
ft in length, protecting Aurora Harbor at Juneau. The other projects con-
sist of a pair of jetties at Nome Harbor maintaining a channel at the mouth of
the Snake River and a pair of jetties at Ninilchik Harbor maintaining a chan-
nel at the mouth of the Ninilchik River.
primarily of jetties to stabilize channels at the mouths of rivers to provide
safe navigation. Jetty pairs are located at the mouths of seven rivers, and
three jetty systems are located at the mouths of three rivers. The jetties
range in length from 850 ft at the mouth of the Chetco River to nearly miles
long at the mouth of the Columbia River. They have design waves up to 22 ft,
and some date back to the late 1800's.
NPP maintains breakwaters at four harbors located in bays upstream
from the mouths of three rivers and at two harbors located on the coast.
sist mainly of harbors and small-boat basins protected by breakwaters.
A table of factors for converting non-SI units of measurement to SI
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