harbor side of the west breakwater, and 9-ton tribars on the harbor side of 

 the east breakwater. Table 6 summarizes the construction and rehabilitation 

 history of the breakwaters. 

 Manas quan Inlet 



10. Manasquan Inlet, New Jersey, is located on the Atlantic coast of 

 New Jersey about 26 miles south of Sandy Hook in the boroughs of Manasquan and 

 Point Pleasant Beach (Photo 1) . The inlet forms the mouth of the Manasquan 

 River and the northernmost end of the New Jersey Intracoastal Waterway. In 

 1880 the previously unnavigable inlet was dredged to provide access to a safe 

 harbor for small vessels navigating along the coast. At the same time, 

 sand-filled timber jetties were constructed out to 120 ft beyond the low-water 

 line. The jetties proved to be ineffective in maintaining an open channel, 

 and no maintenance was provided. By 1887, the inlet was totally blocked by 

 sand. In 1930 the 1,230-ft north and 1,030-ft south rubble-mound jetties were 

 constructed. Between 1931 and 1979, the jetties were rehabilitated nine times 

 with progressively larger stone, culminating with placement of 12-ton stone. 

 Dissimiliar armor rehabilitations using 16-ton, steel-reinforced dolosse were 

 carried out on the south and north jetties in 1980 and 1984, respectively. 

 The construction and rehabilitation history is summarized in Table 7. 

 Nawiliwili Harbor 



11. Nawiliwili Harbor, Kauai, Hawaii, is located about 100 miles north- 

 west of Honolulu, Hawaii, on the southeast coast of the Island of Kauai 

 (Plate 11). Construction of the 2,150-ft rubble-mound stone breakwater was 

 completed in 1930. Severe storms in 1954, 1956, and 1957 severely damaged the 

 breakwater, and model tests were conducted in 1958 (Jackson, Hudson, and 

 Housley 1960) to determine the best method of rebuilding the head and 

 strengthening about 500 ft of the seaward end of the breakwater. In 1959 the 

 head and seaward 500 ft of the sea-side slope of the trunk were rehabilitated 

 with dissimiliar armor using 17.8-ton tribars, and a concrete cap was poured 

 on the crest of the breakwater. Of the 598 tribars placed, 351 were rein- 

 forced. One layer of tribars was uniformly placed on the trunk, while two 

 layers of randomly-placed tribars were used on the sea-side slope of the head. 

 A survey of the breakwater in 1975 found varying deterioration of about 



1,000 ft of the armor stone trunk and several slumped areas in the uniformly 

 placed tribars. Hydraulic model tests (Davidson 1978) were conducted to aid 

 in selection of the best rehabilitation method. Rehabilitation, completed in 



