Table 11 



Black River Harbor Breakwaters 



Gogebic County, Michigan 



Date(s) Construction and Rehabilitation History 



1957 The construction of an 825-ft-long east breakwater and a 555-ft-long 

 west breakwater was completed at the site (Figure 25). The break- 

 waters were of rubble-mound construction (Figure 26) with crest els 

 of +7 ft Iwd and crest widths of 8 ft. Side slopes were 1V:1.5H, and 

 3-ton minimum armor stone was used. 



1983 An inspection made of the structures revealed that both breakwaters 

 were in good condition with the exception of several areas on each 

 structure that needed additional core and cover stone. 



1986 Since construction, the breakwaters have been repaired during routine 

 maintenance operations. They presently are in good condition. An 

 aerial view of Black River Harbor breakwaters is shown in Figure 27. 



51 



