Table 30 (Continued) 



Date(s) Construction and Rehabilitation History 



1942 +6-ft mlw crown elevation, a 2-ft crown width, and 1V:1.5H side 



(Cont) slopes. (The cap stone was 4 to 8 tons, and the core stone was 



25 to 2,000 lb.) The total cost of the extensions was $51,100. 



1945 An inspection of the jetties indicated that the seaward end of the 

 west jetty had undergone some settlement. On the east jetty a low 

 saddle allowed waves to overtop the structure, and subsequent ero- 

 sion on the landward side threatened to create a continuous channel 

 from Gulf to Bay. In addition, low sections on the jetty extensions 

 allowed incoming waves to overtop them, with continued erosion of 

 the shoreline behind the extensions. It was concluded that, as ori- 

 ginally constructed (800 ft), the jetties were spaced too far apart 

 (1,500 ft). For this reason, wave attack on the shore landward of 

 the jetty wings was severe, and the shoreline receded rapidly which 

 in turn required extensions of the jetties to halt the erosion and 

 the potential for flanking of the jetties. 



1948 Repair work and landward extensions of 300 and 360 ft on the east 

 and west jetty wings, respectively, were made at a total cost of 

 $143,000. The design cross section was identical to that of the 

 1942 extension. Also, Congress authorized a 34-ft-deep (5 ft 

 deeper) by 450-ft-wide channel between the jetties (this depth was 

 being maintained as early as 1956) . 



1951 Repairs were made to the jetties with 1,980 tons of stone placed at 

 a cost of $22,000. 



1956 The west jetty extended approximately 600 ft on its landward end 



with 410 and 7,330 tons of riprap and cover stone, respectively, at 

 a total cost of $76,300. At this time the cummulative lengths of 

 the east and west jetties were approximately 2,000 and 2,750 ft, 

 respectively. 



1957- Minor repairs consisted of placing 631 tons of stone, and 960 tons 

 1959 of stone were stockpiled. Total cost was $11,300. 



1961- Repairs were made by placing 7,270 and 13,500 tons of stone along 

 1962 the landward sides of the east and west jetty wings, respectively. 

 The repair section (Figure 49) was to have a crest elevation of 

 +6 ft mlw, a crest width of 4 to 10 ft, and a 1-V:1.5-H side slope. 

 Capstone of 8- to 10-ton size was placed on the inner 1,235 ft of 

 the west jetty, and 6- to 8-ton capstone was placed along an adja- 

 cent 430-ft section and on the inner 1,025-ft of the east jetty. 

 The design was based on Hudson's equation and 10- to 12-ft wave 

 heights. A 2-ft foundation blanket of 15- to 200-lb stone was 

 placed and overlaid on the capstone and 100- to 1,000-lb core stone. 



(Continued) 



89 



(Sheet 3 of 6) 



