Table 14
Lac La Belle Harbor Breakwaters
Keweenaw County, Michigan
Construction and Rehabilitation History
1959
Construction of two breakwaters was completed at the site (Fig-
ure 3 )
6 . Three consisted of a 490-ft-long north breakwater and a
689-ft-long south breakwater. The north breakwater consisted of a
458-ft steel Z-piling section and a 32-ft cellular steel sheet-pile
head. The south breakwater had a 470.5-ft steel Z-piling section
with cellular steel sheet piles on the lakeward end cumulating over
218 ft in length (Figure 3 )
6 . The Z-piling and the cellular struc-
tures were both built to an el of
ft lwd. The cellular sheet
piles were 32 ft in diameter and were sand filled with a 2-ft rock
7 . Rock toe protection was provided on the lakeside of
cap (Figure 3 )
the outer cells on the south breakwater.
1983
An inspection of the structures revealed a tipped section toward the
channel on the south breakwater about 50 ft shoreward of the cells.
Subsequently, the tipped section was straightened, and stone was
added on the channel side to prevent scour.
The breakwaters presently are in good condition. An aerial view of
1986
Lac La Belle Harbor breakwaters is shown in Figure 38.
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