Table 31 



Manasquan Inlet Jetties 



Manasquan, New Jersey 



Philadelphia District 



Date(s) Construction and Rehabilitation History 



1882 A 1 ,515-ft-long timber jetty and dike was constructed north of the 

 inlet. 



1883 A timber jetty was constructed south of the inlet to a length of 

 approximately 500 ft. 



1886 The south jetty was flanked, and use of the inlet was seriously 

 impaired. 



1922 New timber jetties were constructed. 



1924 The jetties were in a state of disrepair. 



1930- Two rubble-mound jetties were constructed north and south of the 

 1931 inlet to replace the timber jetties and provide channel protection. 

 The north jetty was 1,230 ft long, and the south jetty was 1,030 ft 

 long. The jetties were spaced 400 ft apart and built to an elevation 

 of +14 ft mlw, with a 12.0-ft crown width and side slopes of 1V:1.5H 

 on the ocean side, and 1V:1H on the channel side (Figure 38). Cap- 

 stone was 2.0 ton, and core stone ranged from 100 to 500 lb. 



1946 Both jetties were rehabilitated using 5,190 tons of capstone, 

 2,886 tons of corestone, and 628 cu yd of grout. The cost of 

 rehabilitation was $56,778. 



1955 The north jetty was rehabilitated using 5,400 tons of stone at a cost 

 of $128,597. 



1959 The south jetty was rehabilitated using 12.0-ton capstone at a cost 

 of $67,048. 



1977 The seaward 100 ft and 60 ft of the north and south jetties, respec- 

 tively, were destroyed through continued displacement of armor stone 

 and loss of structural integrity. The south jetty was damaged from 

 the seaward end to 700 ft shoreward. Sand passed from the south 

 jetty fillet through and over the jetty into the inlet. 



1979- Both jetties were rehabilitated using dolosse. Sand and displaced 

 1982 stone were excavated and reshaped to design configuration before 



dolosse placement. Sixteen-ton dolosse were placed along the seaward 

 400 ft on the north side of the south jetty, around the jetty head, 

 and along the seaward 50 ft on the south side. The dolosse extended 

 to -10 ft mlw on the channel side, with side slopes of 1V:2H, and 

 front slopes of 1V:3H. The seaward 400 ft was concrete capped, 20 ft 

 wide, and was built at an elevation of +14 ft mlw. Sixteen-ton 

 dolosse were placed along the seaward 250 ft on the north side of the 

 north jetty, around the jetty head, and along the seaward 90 ft on 



(Continued) 

 65 



