Table 17 



Presque Isle Harbor Breakwater 



Presque Isle, Michigan 



Date(s) Construction and Rehabilitation History 



1897- Construction of a 1 ,053-ft-long breakwater was performed during this 

 1901 period (Figures 45 and 46, Section B) . The structure was a 24-ft- 



wide stone-filled timber crib breakwater with riprap toe protection. 



1903 A 163-ft-long stone-filled timber crib breakwater (16 ft wide) was 

 completed connecting the original structure to shore (Figures 45 

 and 46, Section A). 



1927 A stone and concrete capped superstructure was built on the existing 

 structures (Figures 45 and 46, Sections A and B) . The crest el of 

 the structure was +8 ft Iwd. 



1938 Construction of the breakwater head was completed. The structure was 

 a stone-filled timber crib breakwater that was 30 ft in width (Fig- 

 ures 45 and 46, Section D) . The stone portion of the substructure 

 and stone placed on the lakeward side of the breakwater were in- 

 stalled at an el of +8 ft Iwd. Armor stone on the lakeside and toe 

 protection on the harbor side of the structure were in the 10-ton 

 range. The concrete superstructure was built to an el of +16 ft Iwd 

 for a lighthouse. 



1938- A 1 ,600-f t-long rubble-mound breakwater was constructed connecting 



1939 the breakwater head to the existing structure (Figures 45 and 46, 

 Section C) . The crest was 12 ft wide with an el of +8 ft Iwd. Ten- 

 ton armor stone was used. 



1963 Riprap cover stone (5.5 ton) was installed for a distance of 180 ft 

 on the harbor side and 400 ft on the lakeward side of the original 

 timber crib structure (Figure 46, Section B) . The inner 1,216 ft of 

 breakwater was rehabilitated for a cost of $76,500. 



1975 An inspection of the site indicated that the outermost portion of the 

 rubble-mound breakwater needed some minor stone rearranging. This 

 work was completed later in the year. 



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

 Presque Isle Harbor breakwater is shown in Figure 47. 



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