Table 12 



Savannah Harbor Jetties 



Savannah Harbor, Georgia, SAS 



Date(s) Construction and Rehabilitation History 



1886 The River and Harbor Act of 5 August 1886 provided for two parallel 

 training walls (hereafter referred to as jetties) at the mouth of 

 the Savannah River (Figure 19) . 



1886- The Oyster Bed Jetty was constructed to a length of 12,000 ft with 

 1890 stone placed upon a timber and brush mat foundation. 



1890- Cockspur Jetty was constructed to a length of 12,000 ft with stone 

 1896 placed upon a timber and brush mat foundation. By 1896 the channel 



had been dredged to the design depth of -19 ft mlw. The distance 



between the jetties was 2,500 ft. 



1914 A survey of Oyster Bed Jetty showed crest elevations from +2 ft mlw 

 nearshore to -2 ft mlw at 10,000 ft and from -4 to -8 ft mlw over 

 the seaward 2,000 ft. Planned improvements called for raising the 

 jetty to mean high water (mhw) by placing small stone over the ex- 

 isting stone with larger stone used as cover and design side slopes 

 of 1V:1.25H. 



1915- Part of Oyster Bed Jetty was raised to mhw. 

 1916 



1921 A survey of Cockspur Jetty showed the shoreward 2,000 ft at about 

 +6 to +7 ft mlw, the next 9,000 ft from +3 to +5 ft mlw, and the 

 seaward 1,000 ft from -4 to -8 ft mlw. A survey of Oyster Bed Jetty 

 showed the first 6,000 ft of the jetty at +6 to +7 ft mlw. The 

 outer unimproved portion of the jetty composed of small stone had 

 subsided from 1 to 3 ft since the 1914 survey. 



1923 The outer portion of Oyster Bed Jetty was raised to mhw. Design im- 

 provements consisted of a crest elevation of +6.8 ft mlw, crest 

 width of 8 ft, and side slopes of 1V:1.25H. The cross section con- 

 sisted of core stone with large cover stone (Figure 20) . A post 

 construction survey showed the seaward end of the jetty, with 

 approximately IV: IH side slopes, was the only section with side 

 slopes exceeding the design value. 



1926 During a survey of Oyster Bed Jetty, crest elevations varied from 

 +5 to +7.5 ft mlw over the entire length. 



1935 The Oyster Bed and Cockspur Jetties were surveyed. There were no 

 major areas of damage and only negligible subsidence when compared 

 to previous surveys of 1921 and 1926. Between the 1921 and 1935 

 surveys 500 ft of Cockspur Jetty, 500 ft from the original seaward 



(Continued) 



36 



