Table 10 



Georgetown Harbor Jetties 



Georgetown, South Carolina, SAC 



Date(s) Construction and Rehabilitation History 



1890- Two jetties (Figure 17) composed of stone on brush mattresses were 

 1904 constructed as part of a project to maintain a -15 ft mlw access 



channel. The north jetty was constructed to a length of 11,140 ft 

 with a crest elevation of 4.5 to 6 ft mlw, except the outer 100 ft 

 which was below mlw. The south jetty was constructed to a length of 

 21,050 ft with crest elevations ranging from +10 ft mlw at the root 

 to mlw at the outer end. A 14,200-f t-long earthen dike was con- 

 structed to serve as a root for the south jetty and protection for 

 South Island. The parallel ends of the jetties were approximately 

 4,800 ft apart. 



1949- Crest elevations along the jetties were as much as 12 ft below 

 1951 original heights. Also at this time, the channel depth was in- 

 creased to -27 ft mlw. Structural improvements, although consid- 

 ered, were not carried out since maintenance dredging was considered 

 to be the most cost-effective means of providing the required chan- 

 nel depth. 



1985 Periodic dredging maintains the channel depth through the jetties at 

 -27 ft mlw. No repair or maintenance of the jetties has been under- 

 taken since their construction. 



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Figure 17. Georgetown Harbor 

 jetties. South Carolina 



33 



