Struc- 



Table 



Location 



ture Structure 

 Type & Construction Length 

 No. Materials ft 



Lake Superior (Continued) 



Date 



of 



Origin 



Improve- 

 ment 









13 



Keweenaw Waterway, 

 Mich. 



B(3^ 



TC,S,SSP,C, 

 CC 



8,844 



1860 



N 



14 



Lac La Belle 

 Harbor, Mich. 



B(2' 



) SSP,CSSP,S 



1,179 



1959 



N 



15 



Grand Traverse Bay 

 Harbor, Mich. 



P(2' 



SSP.CSSP.S, 

 CC 



1,618 



1949 



M 



16 



Big Bay Harbor, 

 Mich. 



B(2' 



) S,SSP,CSSP 



1,258 



1960 



R 



17 



Presque Isle 

 Harbor, Mich. 



B(l 



) TC,S,C 



2,816 



1897 



R 



18 



Marquette Harbor, 

 Mich. 



B(l 



) TC,S,CC 



4,510 



1867 



R 



19 



Grand Marais 

 Harbor, Mich. 



P(2' 



) TC,S,CC,WP, 

 CSSP 



4,409 



1883 



R 



20 



Little Lake Harbor, 

 Mich. 



B(2 



) S,CSSP 



1,270 



1964 



N 



21 



Whitefish Point 

 Harbor, Mich. 



B(3 



) CSSP,SSP,S, 

 CC 



1,364 



1968 



N 





Manistique Harbor, 

 Mich. 



B(2 

 P(l 



Lake Michigan 



4,046 



1887 





22 



) TC,S,CC,WP 



M,R 



23 



Cedar River Harbor, 

 Mich. 



P(2 



) WP,S 



1,100 



1883 



M 



24 



Memominee Harbor, 

 Mich. 



P(2 



) WP,S,C,CC,SSP 



3,912 



1871 



R 



25 



Oconto Harbor, Wis. 



P(l 



) WP,S,CSSP,CC 



2,144 



1883 



R 



26 



Sturgeon Bay Canal, 

 Wis. 



B(2 



) TC,CC,S,WP 

 (Continued) 



2,688 



1873 



N 



(Sheet 2 of 8) 



12 



