Table 14 



Moriches Inlet Jetties 



Great South Beach and Pikes Beach, New York 



New York District 



Date(s) Construction and Rehabilitation History 



1953 Construction of two jetties by local interests was completed at 

 lengths of 750 ft east and 1,420 ft west. Elevations were +9.0 ft 

 mlw, crown widths were 12.0 ft, and side slopes were 1V:1.5H. One 

 layer of capstone was placed over core stone, which rested on a 

 2-ft-thick blanket. Stone sizes used on the east jetty were 4.0- to 

 10.0- ton capstone and 5.0-lb to 1.0- ton core stone on the shoreward 

 580 ft, and 6.0- to 12-ton capstone and 5.0-lb to 2.0-ton core stone 

 on the remainder of the jetty. The west jetty consisted of 2.0- to 

 6.0- ton capstone and 10-lb to 1,000-lb core stone on the shoreward 

 1,280 ft and 6.0- to 12-ton capstone and 10-lb to 1.0-ton core stone 

 elsewhere. Blanket and apron stone was 5.0 to 500 lb and 10 lb to 

 500 lb on the east and west jetties, respectively. Cost was $327,630 

 for the east jetty and $420,210 for the west jetty, all non-Federal 

 funds . 



1954 Local interests extended the jetties to 841 ft east and 1,461 ft west 

 (Figure 19) using 6.0- to 12.0-ton capstone at 1V:2H side slopes. 

 Core stone used was 15 lb to 5.0 ton, east jetty, and 10 lb to 2.0 

 tons west jetty. A 2.0-ft-thick blanket and apron was placed using 

 15- to 500-lb stone. Jetty ends were approximately 800 ft apart. 

 Cost was $194,290 east and $142,260 west. 



1956 An inspection of the jetties was conducted. Stone on the inlet side 

 of both jetties had slipped at numerous locations. Slope stones and 

 capstones had unraveled at the outer end of the east jetty. Approxi- 

 mately 300 ft of the west jetty had settled 2.0 to 3.0 ft. The 

 jetties had undergone severe wave attack since their construction, 

 and most of the damage was attributed to the hurricane of August 31, 

 1954. 



1983 A survey indicated the jetties were in a good, stable condition. The 

 jetties had settled approximately 2.0 ft over 65 ft on the east jetty 

 and 130 ft on the west jetty. The jetties did not meet Corps of 

 Engineers standards for armor stone layer thickness, weight, or ele- 

 vation, and it was determined that it would be more economical to 

 maintain the jetties on an annual basis than by rehabilitation. 

 Potential damage was anticipated to increase. 



1986 No further repair or maintenance information has been found. 



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