Table 14 



Lac La Belle Harbor Breakwaters 



Keweenaw County, Michigan 



Date(s) Construction and Rehabilitation History 



1959 Construction of two breakwaters was completed at the site (Fig- 

 ure 36) . Three consisted of a 490-ft-long north breakwater and a 

 689-ft-long south breakwater. The north breakwater consisted of a 

 458-f t steel Z-piling section and a 32-f t 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 36) . The Z-piling and the cellular struc- 

 tures were both built to an el of +? ft Iwd. The cellular sheet 

 piles were 32 ft in diameter and were- sand filled with a 2-f t rock 

 cap (Figure 37) . Rock toe protectioa was provided on the lakeside of 

 the outer cells on the south breakVater. 



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. 



1986 The breakwaters presently are in good condition. An aerial view of 

 Lac La Belle Harbor breakwaters is shown in Figure 38. 



67 



