Table 15 



Morro Bay Breakwaters 



Morro Bay Harbor, California 



Date(s) Construction and Rehabilitation History 



19^2 A 1 ,000-ft-long north breakwater was constructed, and a 1,832-ft- 

 1943 long south breakwater was completed at the site (Figure 21) to 

 serve as a base for naval patrol craft. The structures were 

 rubble-mound and built at an el of +16 ft mllw with 1V:1.5H side 

 slopes and a crest width of 16 ft. 



19^3- Storm waves during this period damaged the north breakwater. The 

 19^4 south breakwater received no appreciable damage. 



1945 The north breakwater was repaired and extended to 1,800 ft in 

 length. This work also included widening the crest from 16 to 20 

 ft. The project was adopted and completed under the supervision of 

 the CE using funds provided by the US Navy. 



1946 The north breakwater again suffered damage from storm waves. 



1948 Maintenance work was performed on the north breakwater. Damaged 



sections of the structure were restored, and the cap was bound with 

 concrete across the crest to an el of -2 ft mllw on both sides. 



1949- The north breakwater continued to deteriorate, and shoaling occur- 

 1960 red in the channels. The south breakwater still had suffered no 

 observable damage since its construction in 1943. 



1964 The north breakwater was reconstructed at a cost of $1,561,882. 



The new rubble-mound structure was built at an el of +18 ft mllw, 

 with a 20-ft-wide crest and 1V:2.5H side slopes. The structure was 

 rebuilt about 100 ft bayward of the original north breakwater loca- 

 tion and extended to 1,885 ft in length (Figure 21). The break- 

 water included larger armor stone than the original structure. 

 Also included was a concrete monolithic breakwater head. Model 

 tests were conducted (Jackson 1961). 



1983 Major storms resulted in approximately $1,430,000 in damages to the 

 breakwaters. 



1985 Maintenance repair of the north and south breakwaters was completed 

 which included the placement of approximately 18,000 tons of 

 capstone. Capstones ranged in weight from 6-21 tons each. 



1986 The structures presently are in good condition. 



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