Table 3 (Continued) 



Date(s) Construction and Rehabilitation History 



1952 About 2,300 lin ft of east Jetty was capped with concrete and 



13,360 tons of stone placed at a total cost of $231,500. The cap 

 section was placed immediately landward of the 1939 cap section and 

 was 6 ft wide with a top elevation of +7.5 ft mlg. Stone was placed 

 along the cap section and extended an additional 200 ft landward. 



1955 Repairs to the west Jetty consisted of a 1 , 125-ft-long rubble-mound 

 Jetty at the seaward end (Figure 9) built on the seaside of, and ex- 

 tending 350 ft seaward of, the existing bulkhead; and construction of 

 930 ft of stone dikes, 900 ft of fascine dikes, and I8O ft of sheet- 

 pile weir, all on a 3,600-ft-long section landward of the rubble- 

 mound section. Most of the rubble-mound structure was built on 40- 

 to 70-ft-wide fascine mats ballasted with 25- to 200-lb stone (60 lb/ 

 per sq ft). A 300-ft section, at its landward end, was built on a 1- 

 ft-thick layer of similar sized stone. The design cross section had 

 a +3-ft-mlg crown elevation, crown widths of 5 ft (landward 300 ft) 

 and 8 ft, and 1V:1.5H side slopes. The landward 300 ft was built up 

 using 200- to 2,000-lb stone, and the seaward 300 ft had a cover 

 layer of 5- to 10-ton stone. The Jetty midsection and seaward core 

 stone was 200 lb to 4 tons. Existing water depths varied from -2 to 

 -20 ft mlg at the landward and seaward ends, respectively. The total 

 cost of the Jetty was $134,200 using 41,500 sq ft of mattress and 

 12,170 tons of stone. The steel sheet-pile weir was placed to an 

 elevation of -3 ft mlg along a 100-ft section with an elevation of 

 +5 ft mlg on adjacent 40-ft sections. A total of 1,040 tons of stone 

 was placed along the weir length. A total of 11,270 and 850 tons of 

 stone was placed on the stone and fascine dike sections, respec- 

 tively. The total cost for the dikes and weir was $175,100. 



1957 Repairs were made to 590 ft of the east Jetty and to 110 ft of the 

 west Jetty outlet weir built in 1955. A total of 350 tons of stone 

 was placed at several locations on the west Jetty. The east Jetty 

 work, at the existing landward end (total jetty length, including 

 present work, now 8,930 ft), consisted of 100 ft of rubble-mound 

 weir, 390 ft of rubble-mound Jetty on the existing structure, and 

 100 ft of new rubble-mound jetty. The weir design section had a 4-ft 

 crown width at -2 ft mlg and 1V:1.5H and 1V:2H side slopes on the 

 channel and seasides, respectively. The Jetty design section had a 

 5-ft crown width at +5 ft mlg and 1V:1.5H side slopes. The stone 

 size varied from 200 to 4,000 lb with the largest pieces placed in a 

 2.5-ft-thick cover layer. The sea side of the west jetty weir 

 section had 5- to 75-lb riprap placed at a 1V:2H side slope beginning 

 10 ft from the steel sheet pile. This riprap was covered with a 1.5- 

 ft-thick layer of 75- to 500-lb stone. Total cost for this work and 

 repairs to Southwest Pass Jetties was $499,400. 



1966 The east Jetty concrete cap was buttressed with stone (Figure 10) 



along 3,800- and 6,700-ft-long sections on the sea and channel sides, 



(Continued) 



22 



