Table 67 



Au Sable Harbor Jetties 



Au Sable, Michigan 



Date(s) 

 1962 



Construction and Rehabilitation History 



1975 



1984 



Construction of north and south jetties (Figure 181) was completed. 

 The shoreward 980 ft of the north jetty and 1,000 ft of the south 

 jetty were constructed with steel sheetpiling at a crest el of 

 +8.0 ft Iwd (Figure 182). The lakeward 227 ft of the north jetty and 

 200 ft of the south jetty were constructed with 27.2-ft diameter 

 steel sheet-pile cells. The cells were stone filled and capped with 

 concrete to an el of +8.0 ft Iwd (Figure 182). Riprap was placed on 

 each side of the cellular portions of the breakwater (Figure 182) and 

 along some portions of the steel sheet-pile structures (Figure 181) . 



Rehabilitation of the north and south jetties was completed for a 

 cost of about $392,000. This work included repairs for broken and 

 sunken cell caps and replenishment of riprap in various areas. 



An inspection of the jetties revealed them to be in very good con- 

 dition. An aerial view of the Au Sable Harbor jetties is shown in 

 Figure 183. 



Figure 181. Au Sable Harbor, Michigan 

 280 



