Table 31 (Continued) 



Date(s) Construction and Rehabilitation History 



1968- the placed sheet pile. The deposition basin was dredged to provide 



1969 a 300,000-cu yd volume to acconnnodate a 2-year supply of material 

 (Cont) and was roughly rectangular in shape and 300 ft from the weir sec- 

 tion of the jetty. General design of the jetties was very similar 

 to that of the Perdido Pass jetties. Armor stone sizes were deter- 

 mined for depth-limiting conditions for a +6 ft mlw storm surge 

 superimposed on a 12-ft water depth, resulting in a wave height of 

 14 ft. Total quantities placed were 61,000 tons of cover stone and 

 core stone and 24,200 tons of blanket material. The total cost of 

 the project (including dredging) was $990,000. 



1969- In March 1969 approximately 150 lin ft of timber wales were missing, 



1970 and others had become loose in a number of spots. Similar problems 

 with the timber wales had occurred at the Perdido Pass and Masonboro 

 Inlet weir jetties. The loose wales were refastened by "lock" 

 bolting. 



In April 1969 a field inspection (22 April) showed that all the 

 refastened wales were in excellent condition. A scour though had 

 formed on the channel side adjacent to the weir, while depths on the 

 seaward side were similar to those encountered during construction 

 of the weir. 



In June 1969 field inspection (June 5) showed that approximately 

 100 ft of the concrete sheet-pile weir had failed (apparently the 

 sheet piles had been undermined by scour and had fallen inward 

 toward the deposition basin) near the landward end of the weir sec- 

 tion (where the piles were 10 ft long and originally driven into 

 about 7 ft of sand) . Water depths around the weir failure area were 

 up to 15 ft, while on the seaward side of the still intact weir sec- 

 tion they were 4 to 5 ft. By the end of June, 57,100 cu yd of 

 dredged material was placed as a stop-gap measure to prevent further 

 loss of sheet piles. The gap in the weir at that time was 135 ft. 



In March 1970 an annual survey revealed that the dredged sand placed 

 on the damaged weir section was completely removed. Approximately 

 260 ft of sheet pile was missing and an additional 40 ft, on the 

 landward side of the gap, was in poor condition. The existing 

 depths were up to -25 ft mlw where the weir had existed originally. 



From June to September 1970 repairs were made to the sheet-pile weir 

 when 71,500 cu yd of dredged material was placed in the weir gap to 

 an elevation of -6.5 ft mlw. A 300-ft-long rubble-mound weir sec- 

 tion was placed along the original weir line. The section (Fig- 

 ure 55) consisted of a 2.5-ft-thick layer of 5- to 100-lb blanket 

 stone, 100- to 500-lb cover stone, and 3-ton minimum weir stone 



(Continued) 



(Sheet 2 of 4) 



96 



