Table 23 



Miami Harbor Jetties 



Miami Harbor, Florida, SAJ 



Date(s) Construction and Rehabilitation History 



1904- North and south jetties (Figure 37) 2,300 and 2,200 ft long, respec- 



1926 tively, and 1,000 ft apart, were constructed to provide channel 

 protection. 



1927 Repairs were made to the north jetty and revetment. The jetty sec- 

 tion was rebuilt to original dimensions with an elevation of +6 ft 

 mlw, a crest width of 10 ft, and the side slopes were 1V:1.5H below 

 mlw and IV: IH above mlw. A total of 3,450 tons of granite was 

 placed on the inner 700 ft of the jetty, and approximately 100 tons 

 was recovered and used over the same section. Total cost of the 

 repair was $30,600. These repairs were required because the hur- 

 ricane of September 1926 (passed over Miami) which resulted in 

 several jetty breaches extending below mlw. 



1928 The north and south jetties were extended seaward 1,350 and 600 ft, 

 respectively. The jetty section consisted of a 5-ft crest width at 

 +5 ft mlw with IV: 2H side slopes above mlw and 1V:1.5H below mlw. A 

 total of 9,500 tons of Florida limestone was used as core stone and 

 37,300 tons of granite as capstone. Total cost of the extensions 

 was $208,000. A December survey of the original jetties (excluding 

 the extensions) showed crest elevations ranging from +4 to -2 ft 

 mlw. Approximately 100 ft of the old seaward ends were below mlw. 



1929 The jetties and north revetment were repaired. A total of 1,600 ft 

 of the north jetty, 700 ft from its inner end, and 2,200 ft of the 

 south jetty (exclusive of the 1928 extension) was repaired with 

 granite stone to a crest width of 10 ft, an elevation of +5 ft mlw, 

 and IV: IH side slopes. Stone weighing 13,800 and 18,900 tons was 

 used on the north and south jetties, respectively. The total cost 

 of jetty repairs was $181,000. 



1931- Both jetties were surveyed in 1931 and 1932. Centerline elevations 

 1932 for the north jetty were from +9.5 to +4 ft mlw on the inner 



2,300 ft and from -3 to +4.5 ft mlw on the outer 1,350 ft. (This 

 section was damaged by storm waves during the survey period.) 

 Centerline elevations for the south jetty varied from +4 to +8 ft 

 mlw. 



1933- Based on the previous survey of the jetties, repairs were made to 

 1934 bring the jetties up to the design section. The crest width was 

 10 ft, the crest elevation was +5 ft mlw, the side slopes were 

 IV: 2H, and the granite stone varied from 2 to 10 tons. Several sec- 

 tions on the north jetty, totaling 2,100 ft, were repaired and a 



(Continued) 

 67 



