Table 18 



Marquette Harbor Breakwater 



Marquette, Michigan 



Date(s) Construction and Rehabilitation History 



1867 Construction of the inner 410 ft of the breakwater was completed 



(Figures 48 and 49, Sections A and B) . The structure was a stone- 

 filled timber crib breakwater. The inner 260 ft was 20 ft wide, and 

 the remaining 150 ft was 25 ft wide. 



1868- An additional 1,600 ft of breakwater was built during this time. It 

 1874 also was a stone-filled timber crib structure and was 30 ft wide 

 (Figures 48 and 49, Section C) . 



1889- During this period the breakwater was extended an additional 1,000 ft 

 1894 (Figures 48 and 49, Sections D, E, F, and G) . The structure was a 



stone-filled timber crib breakwater and was 24 ft wide. It was built 

 on a stone base and included riprap toe protection. 



1896- A concrete cap (superstructure) was added to the 1 ,600-f t-long break- 



1904 water built during 1868-74 (Figures 48 and 49, Section C) . The crest 

 el of the structure was +10 ft Iwd. 



1897- A concrete cap (superstructure) was installed on the remaining por- 



1905 tion of the breakwater (Figures 48 and 49, Sections A, B, D, E, F, 

 and G) . The superstructure was built to an el of about +10 ft Iwd. 

 Stone was added on the lakeside of the inner 410 ft (Sections A 



and B), and on both sides of the 123-f t-long section designated as G 

 (Figures 48 and 49) . 



1912- The breakwater was extended an additional 1,500 ft during this 

 1918 period. The extension consisted of a rubble-mound structure (Fig- 

 ures 48 and 49, Section H) . The shoreward 500 ft of structure was 

 installed at an el of +8 ft Iwd, and the outer 1,000 ft was con- 

 structed to a +10 ft Iwd el. The breakwater was constructed of 

 10-ton armor stone. 



1920- Riprap was placed on the lakeside of the 1 ,600-f t-long breakwater 

 1923 originally constructed from 1868-74 (Figure 49, Section C) . 



1965 Rehabilitation of the inner 3,010 ft of the breakwater was completed 

 for a cost of $465,747. 



1979 Stone placement along a 500-ft section of the breakwater (sta 22+50 

 to 27+50) was completed. Also the placement of riprap stabilizing 

 stone at the lakeward structure toe was completed. 



1986 The breakwater presently is in very good condition. An aerial view 

 of Marquette Harbor breakwater is shown in Figure 50. 



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