Table 21 



Whitefish Point Harbor Breakwaters 



Whitefish Point, Michigan 



Date(s) Construction and Rehabilitation History 



1968 Construction of a 507-ft-long south breakwater and a 587-ft-long 

 north breakwater was completed at the site (Figure 56) . The south 

 breakwater consisted of a 323-ft-long steel sheet-pile cantilever 

 wall and a 184-ft-long sand-filled cellular steel sheet-pile struc- 

 ture (Figure 56). The cells were 25.5 ft in diameter and were capped 

 with reinforced concrete. Riprap was placed on each side of the 

 cells. The entire breakwater was constructed to a +8 ft Iwd el. The 

 north breakwater was constructed with sand-filled cellular steel 

 sheet-pile structures that were also capped with reinforced concrete. 

 The shoreward cells were 25.5 ft in diameter, while the lakeward 

 cells had a diameter of 30.2 ft (Figures 56 and 57). Riprap was 

 placed on each side of the structure, and the crest el was +8 ft Iwd. 



1969 A 270-ft-long interior breakwater was constructed (Figure 56) for 

 wave absorption. This structure consisted of steel sheetplling in- 

 stalled at an el of +8 ft Iwd and riprap installed at 0.0 ft Iwd on 

 each side of the structure (Figure 57). The weight of the riprap 

 ranged from 1,600 to 6,000 lb, and about 6,860 tons of stone was 

 used. The cost of this structure was approximately $112,000. 



1986 The breakwaters appear to be functioning well and presently are in 



good condition. An aerial view of Whitefish Point Harbor breakwaters 

 is shown in Figure 58. 



95 



