Table 53 



Portage Lake Harbor Piers 



Portage Lake, Michigan 



Date(s) Construction and Rehabilitation History 



1883- Construction of a 1 , 149-f t-long north pier and a 383-ft-long south 

 1888 pier (Figure 149, Sections B, C, E, and F) was completed during this 



time. The lakeward end of the north pier was built with 24-ft-wide, 



stone-filled, timber cribs (Figure 150, Section B) on a stone base. 



The south pier and the shoreward end of the north pier consisted of 



woodpilings with a stone fill. 



1900- The north pier was extended lakeward by 200 ft (Figure 149, Sec- 

 1901 tion A), and the south pier was extended 900 ft (Figure 149, Sec- 

 tions A and B) . The lakeward 200 ft of each pier consisted of 30-f t- 

 wide stone-filled timber cribs (Figure 150, Section A) built on a 

 stone base. The trunk portion of the south pier was similar except 

 it was 24 ft in width (Figure 150, Section B) . 



1939- The shoreward ends of the piers (Figures 149 and 150, Sections C, E, 

 1940 and F) were rebuilt with woodpilings spaced from about 18 to 24 ft 



apart and filled with stone. Concrete and stone superstructures were 

 constructed along the entire length of each pier (Figure 150) to a 

 crest el of +7.0 ft Iwd. 



1980- Riprap stone was placed around the heads of the north and south piers 

 1981 (Figure 149, Section A) during this period, and stone fill was re- 

 plenished at various areas along both piers. After replenishment, 

 the concrete caps were repaired. 



1985 An inspection of the site indicated the piers were, in general, in 

 fair condition. Settlement and cracking of the superstructure and 

 fill stone loss indicate some substructure deterioration. Replenish- 

 ment with large fill stone has been recommended along with additional 

 riprap installation. An aerial view of Portage Lake Harbor piers is 

 shown in Figure 151. 



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