Table 12 (Continued) 



Date(s) Construction and Rehabilitation History 



1964- The west jetty was extended 300 ft seaward as part of improvements 

 1965 which included deepening the 100-ft-wide channel from -4 to -8 ft 



mlw. The purpose of this extension was to reduce potential channel 

 shoaling. Constructed parallel to and 250 ft from the east jetty, 

 the extension brought the outer ends of the jetties abreast of one 

 another. The rubble-mound cross section was placed to +15 ft mlw, a 

 6-ft crown width, and side slopes of 1V:1.5H. The section was made 

 up of a 1-ft-thick bedding layer of 1-to 50-lb stone, a core of 10- 

 to 2,000-lb stone, and a 3-ft-thick cover layer of 1- to 4- ton stone. 

 The outward facing semicircle at the jetty head had an 8-ft crown 

 width, 1V:2H side slopes, and a 4-ft-thick cover layer of 3- to 7- ton 

 stone. A total of 950 cu yd of bedding stone and 9,000 tons of core 

 and cover stone were placed for a cost of $70,000. Cover stone size 

 was selected using Hudson's slope stability formula and depth-limited 

 wave heights of 7.5 and 10.5 ft for the trunk and head, respectively. 



1969 Repairs were made by placing quarried stone on the east jetty seaward 

 slope from approximately 1+00 to 5+00. Also included were repairs of 

 an undermined channel side section between 2+50 and 2+60 and a 

 breeched section, with a maximum depression of about 9 ft, between 

 3+20 and 3+50. Prior inspections between 1964 and 1967 indicated the 

 jetty was in poor condition. The seaward slope armor stone was 

 placed to +16 ft mlw, a minimum, composite top width of 6 ft (in- 

 cluding the existing capstone), and a 1V:1.5H side slope. The core 

 consisted of chips to 2,000-lb stone, and the cover layer was 5- to 

 8-ton stone. The damaged sections were repaired by resetting 

 existing stone blocks and adding new stone. The design channel side 

 slope was 1V:1H. A total of 5,600 tons of stone was placed for a 

 cost of $100,800. The west jetty was in good condition with only 

 minor displacement of armor stone along the recent extension. 



1977- Visual inspections indicated the jetties were in poor condition. On 

 1978 the east jetty the seaward side of the head (stone pier) was severely 

 damaged, void spaces in the seaward slope armor stone were evident, 

 and the channel side toe was in a deteriorated state due to under- 

 mining. On the west jetty extension the outer 150 ft had large 

 amounts of displaced cover stone with typical elevations from +6 to 

 +13 ft mlw. The remainder of the extension was in considerably 

 better shape with only minor displacement and settlement of the armor 

 stone . 



1981 The jetties were repaired with armor stone along the damaged sections 

 observed on previous inspections and a topographic survey. The 

 channel side of the east jetty, from 1+66 to 3+80, was repaired with 

 5- to 8-ton stone placed to an elevation of +12 ft mlw, a 1V:1H side 

 slope, and a top width varying from to 4 ft. The east jetty's 

 seaside was repaired between 4+20 and 5+24 using 5- to 8-ton stone 



(Continued) 

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