Table 13 



Moss Landing Jetties 



Moss Landing Harbor, California 



Date(s) Construction and Rehabilitation History 



1947 Construction of protective jetties at the site was completed to 

 stabilize the entrance (Figure 19). The north and south jetties 

 are 900- and 330-ft long, respectively, and are roughly parallel. 

 Crest els of the jetties range from +8 ft to +12 ft mllw, and side 

 slopes vary from 1V:1.5H to 1V:1.75H. 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 900- 

 ft 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. 



1949 To add permanence to the emergency work of 1947, additional armor 

 stone was placed on the previous enrockment. This effort required 

 a total of 24,625 tons of stone. 



1949. Severe erosion around the jetties and the unprotected shorelines 

 1965 adjacent to them was experienced during this time frame. 



1966- Approximately 285 ft of the north jetty and the entire length of 

 1967 the south jetty were repaired. Also about 280 ft 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. 



1975 A field inspection revealed the jetties in satisfactory condition 

 except for 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. 



1976 A basis for design of repairs to the jetties and revetment was pre- 

 pared. Estimated cost of these repairs was $290,000, 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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