Table 2 

 Two Harbors Breakwaters 

 Two Harbors, Minnesota 



Date(s) Construction and Rehabilitation History 



1893 Construction of a 900-ft-long stone-filled timber crib breakwater 

 (Figure 7, Sections C, D, and E) was completed at the site. The 

 cribs were built on rubble-mound foundations. The easternmost 800 ft 

 of the structure was 24 ft wide (Figure 8, Section C) , the adjacent 

 50-ft portion was 20 ft wide (Figure 8, Section D) , and the western- 

 most 50 ft of the breakwater was 16 ft wide (Figure 8, Section E) . 



1933- A concrete cap (superstructure) was built on the breakwater. The 

 1934 crest el was +7 ft Iwd (Figure 8, Sections C, D, and E) . 



1947- A 1 ,302-ft-long stone-filled timber crib breakwater on a rubble-mound 



1949 base was constructed (Figures 7 and 8, Section B) . The structure was 

 30 ft wide. The rubble-mound base consisted of 5-ton cover stone on 

 1V:1.5H side slopes. 



1948 Construction of a 326-ft-long rubble-mound shore connection of the 

 east breakwater was completed (Figures 7 and 8, section A). The 

 crest was 12 ft wide with a +6 ft crest el. 



1948- A concrete cap (superstructure) was built on the 1 ,302-ft-long break- 



1950 water that was completed during 1947-49 (Figure 8, Section B) . The 

 crest el of the structure was increased to +8 ft. 



1986 Since construction, records indicate that localized damage of the 



breakwaters has occurred and has been repaired during routine main- 

 tenance. The structures are presently in good condition. 



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