Table 3 



Noyo Jetties 



Noyo River and Harbor, California 



Date(s) Construction and Rehabilitation History 



1924 Construction of two jetties across a sand bar was completed at the 

 mouth of Noyo River. These were rubble-mound structures spaced 

 approximately 125 ft apart. The initial lengths of the north and 

 south jetties were 648 and 110 ft, respectively. 



1931 Work at the Noyo River entrance, which included dredging, rock re- 

 moval, and reconstruction of the jetties, was completed. The jet- 

 ties were constructed to their present lengths (Figure 7). The 

 north jetty was constructed of mass concrete. It was 345 ft long 

 and connected to a 620-ft-long concrete wall. The south jetty was 

 constructed 234 ft long with concrete. Both structures had crest 

 els of +14 ft mllw. 



1945 A 1 , 100-ft-long outer rubble-mound south breakwater was authorized 

 (Figure 7). This structure has not been constructed. 



1954 Stone (10-ton) was added to the seaward side of the north break- 

 water (Figures 7 and 8). 



1961 Minor rehabilitation of the jetties and north wall was completed. 



1962 A 500-ft-long outer rubble-mound north breakwater was authorized 

 (Figure 7). This structure has not been constructed. 



1970 The two outer breakwaters authorized by the Acts of 1945 and 1962 

 were reclassified from an active to inactive category. They were 

 not economically feasible because of the high cost of construction 

 and maintenance. Model testing of the structures was conducted 

 (Wilson 1967). 



1983 Restoration of the north jetty head was completed. Materials used 

 consisted of approximately 2,500 tons of capstone, 10 cu yd of con- 

 crete, 1,500 cu yd of sandfill, and 4,100 tons of quarrystone fill, 



1986 The jetties are presently in good condition. Model testing cur- 

 rently is being conducted to optimize the location of a struc- 

 ture in the immediate area of the River entrance (Bottin, in 

 preparation) . 



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