Table 1 1
Halfmoon Bay Breakwaters
Halfmoon Bay, California
Construction and Rehabilitation History
1961
The CE completed construction of two rubble-mound, shore-connected
breakwaters to protect the harbor during severe storms (Figure 1 )
The west breakwater was 2,620
long, and the east breakwater
4,420 ft long. The crest of each structure varied from + 1 1 to
+13 ft mllw with side slopes of
and
The cost of the project was ,840,000.
Storms experienced subsequent to breakwater construction indicated
1964
they did not provide adequate protection during periods of heavy
seas and swell. Between 1 6 and 1964, 58 moored vessels were lost
91
or
various marina facilities suffered damages, and two
lives were lost during storm conditions.
A 1,050-ft-long extension of the west breakwater in an easterly
1967
conditions in the harbor (Wilson 1965). The breakwater extension
to +15 ft mllw.
was constructed with a crest el varying from
The side slopes on the harbor side of the structure were
side slopes on the sea side for the first 900 ft.
with
The side slopes on the head varied from
The
to
cost of the extension was approximately
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,957,400.
1986
A condition survey of the navigational facilities presently is
under way.
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