Table 40 

 Burns Harbor Breakwater 

 Burns Waterway, Indiana 



Date(s) Construction and Rehabilitation History 



1968 Construction of a 5 ,830-ft-long, rubble-mound breakwater (Figure 104) 

 was completed. The structure had a crest el of +14 ft Iwd with a 

 width of 17 ft. Armor stones ranging from 10 to 16 tons were placed 

 with side slopes of 1V:1.5H. Model tests were conducted to determine 

 breakwater stability (Jackson 1967) . 



1975 An inspection of the breakwater indicated that settlement of the 

 structure in several locations below the constructed +14-ft-lwd crest 

 el had occurred, and the breakwater was subsequently being overtopped 

 during all seasons by less than the design waves. A total of 

 16,730 tons of stone was placed during the year. Stone sizes ranged 

 from 3 to 16 tons having a 9-ton average. 



1976 A total of 17,267 tons of stone ranging from 3 to 16 tons (9-ton 

 average) was placed on the breakwater. 



1977 A total of 10,027 tons of stone ranging from 3 to 16 tons (9-ton 

 average) was placed on the breakwater. 



1978 A total of 14,340 tons of stone ranging from 3 to 16 tons (9-ton 

 average) was placed on the breakwater. 



1980 A total of 47,334 tons of stone ranging from 3 to 16 tons (9-ton 

 average) was placed on the breakwater. 



1984 A storm in March caused damage to the breakwater dislodging armor 

 stone in many areas and the overall integrity of the above-water 

 stone placement. 



1986 The breakwater has undergone extensive maintenance and rehabilitation 

 since its construction because of structure slumping. The exact 

 cause of the slumping is not known. A study is presently being con- 

 ducted to identify the cause of the problem where remedial measures 

 can be taken. 



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