Table 71 



Port Austin Harbor Breakwater 



Port Austin, Michigan 



Date(s) Construction and Rehabilitation History 



1959 Construction of a 1 ,926-ft-long offshore breakwater (Figure 190) was 

 completed. The breakwater was built with cellular steel sheetpiling 

 which ranged from 15.3 (Type D) to 30.4 ft (Type A) in diameter (Fig- 

 ure 190) . The cells were filled with sand and gravel and crowned 

 with a bituminous cap. The crest el of the breakwater was +10 ft Iwd 

 for Types A and B and +8 ft Iwd for Types C and D. Riprap was placed 

 along the sides of the cellular breakwater except on the harbor side 

 of Types C and D. 



1979 The lakeward cells (Types A and B) were replenished with stone and 

 capped with concrete. 



1983 The shoreward cells (Types C and D) revealed hairline cracks in the 

 asphalt which were sealed. Caulking of construction joints in the 

 breakwater also was performed. 



1986 A safety railing was installed on the structure. The breakwater is 



considered to be in good condition; however, some construction joints 

 are separating and require repairs. An aerial view of the Port 

 Austin breakwater is shown in Figure 191. 



291 



