Table 14 (Concluded) 



Date(s) Construction and Rehabilitation History 



1961 action causing increased consolidation. Repairs were made to bring 

 (Cont) the structure back up to previous designs but with larger stone. 



The design called for 10- to 14-ton granite stone and a crown width 

 of 10 ft for all repair sections (Figure 25). On the concrete cap 

 section of the north jetty, between 62+00 and 85+88, the crown ele- 

 vation was to be +11 ft mlw, and the side slopes were 1V:1.5H. The 

 remainder of the jetty repairs were to have a +8 ft mlw crown ele- 

 vation and 1V:1.5H side slopes (with the exception of the north 

 jetty ocean-side slope which was 1V:2H). The design was based on a 

 14- to 15-ft wave height and Hudson's stability equation. Cost of 

 the rehabilitation with 5,500 tons of stone was $54,600. 



1969 Rehabilitation of jetties was carried out on approximately the same 

 section as the 1961 repairs (Figure 25) . Except for the use of 

 12- to 16-ton stone, the design sections were identical to those of 

 1961. The north jetty from sta 50+45 to 85+80 was built up to 

 +11 ft mlw with 1V:1.5H side slopes and from sta 85+80 to 122+80 was 

 built up to +8 ft mlw with IV: 2H and 1V:1.5H side slopes on the 

 ocean and channel sides, respectively. The south jetty from 

 sta 85+90 to 103+20 was built up to +8 ft mlw with 1V:1.5H side 

 slopes. The crown width on all sections was 10 ft. Dislocation and 

 consolidation of cover stone overlying smaller stone (below mlw) was 

 thought to be the cause of jetty deterioration. The low areas to be 

 repaired were wide which provided a good base to place new stone. 

 Wave heights of 14 and 15 ft and Hudson's stability equation were 

 used, similar to those in the 1961 design. A total of 21,500 tons 

 of stone was placed at a cost of $398,000. Inner areas of the 

 jetties were not rehabilitated although in need of some repairs. 



1985 The jetties are presently in need of another rehabilitation to bring 

 them up to previous designs. The Navy maintains a 42-ft-deep chan- 

 nel between the jetties (Federal project depth is 38 ft) to provide 

 deep-water access to its base at Mayport. 



(Sheet 4 of 4) 

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