Table 8 



Bayou LaFourche Jetties 



Bayou LaFourche, Louisiana 



Date(s) Construction and Rehabilitation History 



1939 Two steel sheet-pile jetties were constructed at Belle Pass (Fig- 

 ure 19) providing protection for an authorized 6- by 60-ft channel. 

 The Jetties were 690 and 570 ft long on the east and west sides, re- 

 spectively, and extended out to about the -6 ft mlg contour. The 

 seaward 350-ft sections of the jetties were parallel and spaced 

 190 ft apart, and landward ends flared out at 45 deg angles. The 

 tops of the sheet piles were driven to ft mlg and bracketed by a 

 double row of creosoted timber piles placed to a top elevation of 

 +5.3 ft mlg. A 3-ft-thick: layer of riprap was placed at the seaward 

 end of each jetty, extending a distance of 50 ft. 



1940- Storm action in 1940 badly damaged the jetties, and they subsequently 

 1941 were reinforced at their bases with rubble stone. In 1941 the land- 

 ward ends of the jetties were repaired and extended using 2,090 tons 

 of stone. 



1948- During this period additional stone was placed on the jetties, land- 

 1954 ward extensions were made, and a rubble-mound groin was constructed 

 about 250 ft east of the east jetty (Figure 19). The jetties were 

 flanked during a 1947 hurricane, necessitating repairs and landward 

 extensions in 1948. A rubble-mound section was placed along portions 

 of the sheet-pile jetty. In 1952 further maintenance work was done 

 on the rubble-mound sections which were brought up to grade. 

 Additional work was done in 1953, including landward extension of the 

 jetties (making the total length of each about 1,000 ft) and con- 

 struction of a 120-ft-long east groin. In 1954 the groin was ex- 

 tended seaward 120 ft, and additional work was done to bring the re- 

 mainder of the jetties up to grade. By this time, stone placed on 

 the seaward sides of the jetties had been brought up to +6 ft mlg 

 with a 1V:1.5H side slope (same elevation and side slopes used on 

 landward extensions). The landward jetty extensions and groin were 

 required due to the continued recession of the shoreline, averaging 

 about 15 ft/yr. The steel sheetpiling was still in place but was no 

 longer considered effective. Cover stone sizes ranged up to a 

 maximum of 6 tons. 



1958 About 570 ft of the seaward end of the west jetty (the 1939 section) 

 was moved 115 ft westward because the original width was inadequate 

 for increased use of the waterway (Figure 19)- This work was carried 

 out by the State of Louisiana Department of Public Works. 



i960 The jetties and groin were repaired with additional 500-lb to 4-ton 



stone. Prior to repair, center-line elevations (January survey) were 

 from -3 to +7 ft mlg on the west jetty, from +3.5 to +6 ft mlg on 



(Continued) 



45 



