Table 10 



Calcasieu Pass Jetties 



Calcasieu River and Pass, Louisiana 



Date(s) Construction and Rehabilitation History 



1893- Two Jetties were constructed at Calcasieu Pass to secure a 12- by 

 1905 200-ft channel (Figure 21). The method of construction was similar 

 to that for the Sabine Pass Jetties which consisted of stone placed 

 on a foundation mattress of brush. The east jetty was built during 

 1893-1897 to a length of 7,850 ft, and the west jetty was built 

 during 1896-1900 to a length of 3,200 ft. By 1899, both Jetties had 

 been badly damaged by storms which displaced about 3,000 tons of 

 granite capping blocks. During 1904-1905 the Jetties were repaired, 

 and the east jetty was extended 6OO ft seaward. This work required 

 21,000 tons of riprap stone, 5,000 sq yd of mattress, and resetting 

 52 granite capping stones. 



I94O- In 1940 the west jetty was repaired and extended 2,600 ft seaward 

 1942 parallel to the east jetty (1,000 ft apart). During 1941-1942 



approximately 220,000 tons of stone was used in repairing the east 

 jetty and to the -10 ft mlg contour, extending the east and west 

 jetties 2,000 and 2,325 ft, respectively, to the 10-ft mlg contour. 

 Prior to improvements, center-line elevations were from +1 to +3 ft 

 mlg and from -2 to +4 ft mlg on the east and west jetties, 

 respectively. The design sections (Figure 21, inset) for the extens- 

 ions employed 5- to 10-ton cover stone and 25-lb to 4-ton core stone 

 and were placed atop fascine mats ballasted with riprap. The east 

 jetty was to have a crown elevation of +6 ft mlg and a crown width of 

 15 ft. Similar values for the west jetty were +4 ft mlg and 10 ft, 

 respectively. The design side slopes were 1V:1.25H. 



1952- Center-line surveys, taken in 1952 and I960, show a general settle- 

 1960 ment of up to 2 ft on the east jetty and 1 to 2 ft on the west 



jetty. The 1952 elevations were at, or slightly above, the design 



elevations used in the 1940-1942 improvements. 



1962- Both jetties were repaired, with most of the work carried out on 

 1963 their landward and seaward ends. At their seaward ends, 1,500 ft of 

 the west jetty and 300 ft of the east jetty were repaired with 6- to 

 10-ton stone. An 800-ft-long section near the landward end of the 

 east jetty was repaired with 150- to 500-lb riprap. The geometry of 

 the repair sections was identical to that used on the 1940-1942 

 extensions. Cost of the repair was $98,500 using 5,000 tons of 

 riprap and 4,000 tons of armor stone. Subsequent to this work, 

 additional repairs were made to 1,150 ft of the landward end of the 

 east jetty (including the previous repair area) and on the west 

 jetty. Two sections totaling 215 ft were repaired, and the landward 

 end was extended 50 ft (tie-in). The east jetty repair geometry 

 consisted of a crown width of 10 ft at +6 ft mlg and 1V:1.5H 



(Continued) 



50 



