Table 9 



Murrells Inlet Jetties 



Murrells Inlet, South Carolina, SAC 



Date(s) Construction and Rehabilitation History 



1977- The two armor stone jetties (Figure 16) were constructed at a cost 

 1981 of $7.4 million. The north jetty (total length, 3,420 ft) consists 

 of the 560-ft-long shoreward jetty trunk; a 1 ,350-f t-long armor 

 stone weir section (crest elevation +2.2 ft mlw) ; the 1 ,650-f t-long 

 seaward jetty trunk; and the 150-ft-long head section. The south 

 jetty (total length, 3,320 ft) consists of a 3 , 170-f t-long trunk and 

 a 150-ft head section. The south jetty included an asphalt fishing 

 walkway. Sand dikes composed of dredged material, 400 and 2,815 ft 

 long on the north and south sides, respectively, tied the jetty 

 roots into the existing dune lines. The seaward parallel sections 

 of the jetties were 600 ft apart with a -12 ft mlw channel between 

 them. The design head section called for a double layer of 6- to 

 10-ton stone, a crest width of 18 ft, and a crest height of 

 +9 ft mlw. The trunk sections were composed of one or two layers of 

 4- to 7-ton stone, a 15-ft crown width, and a +9-ft-mlw crown ele- 

 vation. Side slopes were IV: 2H for both head and trunk sections. 

 The trunk and head sections were built upon a 2-ft-thick layer of 

 0.25- to 6-in. foundation stone followed by a 2-ft-thick layer of 

 200- to 2,000-lb stone. To provide toe protection, the double bed- 

 ding layer was extended 10 and 30 ft beyond the toe of the cover 

 stone on the trunk and head sections, respectively. The core stone 

 varied in size from 200 to 2,000 lb. The weir section was made up 

 of one layer of 1- to 9-ton cover stone (crest width of 12 ft) rest- 

 ing on a 2-ft-thick foundation blanket and buttressed on either side 

 with 10-ft-wide by 2-ft-thick sections of 200- to 2,000-lb stone. 

 The design followed the SPM (1984) procedures, and the jetty con- 

 figuration was model tested at WES (Perry, Seabergh, and Lane 1978). 

 The design wave height was 12 ft. 



1985 The jetties have no history of damage or repair and appear to be 

 functioning properly. 



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