Table 40
Burns Harbor Breakwater
Burns Waterway, Indiana
Construction and Rehabilitation History
1968
Construction of a
rubble-mound breakwater (Figure 1 0 4 )
was completed. The structure had a crest el of +14 ft lwd with a
width of 17 ft. Armor stones ranging from 10 to 16 tons were placed
with side slopes of
Model tests were conducted to determine
breakwater stability (Jackson 1967).
1975
An inspection of the breakwater indicated that settlement of the
crest
structure in several locations below the constructed
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)
placed on the breakwater.
A total of 10,027 tons of stone ranging from 3 to 16 tons (9-ton
1977
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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