Table 13
Moss Landing Jetties
Moss Landing Harbor, California
Construction and Rehabilitation History
1947
Construction of protective jetties at the site was completed to
stabilize the entrance (Figure
The north and south jetties
are 900- and 330-ft long, respectively, and are roughly parallel.
of the jetties range from
Crest
ft to +12 ft mllw, and side
slopes vary from
to
During project construction
severe storms resulted in scouring and deep cutting of the sand
adjacent to the jetties. Emergency stone placement was undertaken
along the south jetty from the shore to a point 320 ft seaward.
Stone protection for the north jetty was placed throughout its
length, and additional placement was made along the north and
south shorelines of the jetties. A total of 47,946 tons of stone
was required for this work.
To add permanence to the emergency work of 1947, additional armor
1949
stone was placed on the previous enrockment. This effort required
a total of 24,625 tons of stone.
Severe erosion around the jetties and the unprotected shorelines
1965
adjacent to them was experienced during this time frame.
Approximately 285 ft of the north jetty and the entire length of
1967
the south jetty were repaired. Also about 280
of curved revet-
ment work was added to the north jetty and about 380 ft added to
the south jetty. This work required the placement of 77,560 tons
of stone. The north jetty head was not repaired because of the
movement of the canyon head and the possibility that damage may
occur to any repairs in that vicinity.
A field inspection revealed the jetties in satisfactory condition
1975
except f o r damage on the seaward ends due to erosion and subsequent
stone displacement. The deep submarine canyon head at the seaward
end of the north jetty appeared to have stabilized.
A basis f o r design of repairs to the jetties and revetment was pre-
1976
pared. Estimated cost of these repairs was 0,000, and approxi-
mately 7,400 tons of stone would be required.
1986
Work is still required at the jetty heads. Except for the erosion
at these locations, the jetties historically have performed satis-
factorily and suffered relatively minor damages.
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