Table 56 



Leland Harbor Structures 



Leland, Michigan 



Date(s) Construction and Rehabilitation History 



1936 Construction of a 440-ft-long south pier (Figure 158, Sections B and 

 C) was completed. The pier consisted of woodpilings spaced 11 ft 

 apart and filled with stone (Figure 159, Sections B and C) . 



1952 The lakeward 33 ft of the south pier (Figure 158, Section B) was en- 

 cased in steel sheetpiling. The voids were filled with stone, and 

 the structure was capped with stone (Figure 159, Section B) . The 

 width of this portion of the south pier was 15.25 ft, and the crest 

 el was +8 ft Iwd. 



1966 The lakeward 33 ft of the south pier (Figure 158, Section B) was 



rehabilitated. Riprap was placed on each side of the pier. It was 



-5 ft at its crest and had 1-V:1.5-H side slopes (Figure 159, Sec- 

 tion B) . 



1968 A 407-ft-long portion of the south pier (Figure 158, Section C) was 

 rehabilitated by the placement of stone along both sides and across 

 the top of the pier (Figure 159, Section C) . The new rubble-mound 

 pier had an 8-ft crest width and a +8.0-ft Iwd crest el. Cover 

 stone ranged from 1 (min) to 2 tons (max) , and side slopes were 

 1V:1.5H. A 35-ft-long extension of the south pier (Figure 158, Sec- 

 tion A) involved the construction of two steel sheet-pile cells with 

 diameters of 17.5 ft each. The cells were filled with coarse aggre- 

 gate and capped with 500-lb (min) stone. The crest el of the cells 

 was +8.0 ft Iwd, and riprap was installed around the lakeward cell. 

 A 1,200-ft-long offshore rubble-mound breakwater (Figure 158) also 

 was constructed. The breakwater had an 8-ft crest width, 1-V:1.75-H 

 side slopes on the lakeside, and 1-V:1.5-H side slopes on the harbor 

 side (Figure 159) . The 300-ft-long north shore arm had a crest el of 

 +8.0 ft Iwd (Figure 158, Section II), and the remaining 900 ft of the 

 breakwater (Figure 158, Section I) had a crest el of +10.0 ft Iwd. 

 Cover stone of the breakwater ranged from 5 (min) to 7 tons (max) , 

 and core stone ranged from 500 to 1,000 lb. 



1983 A site inspection of the harbor structures revealed them to be in 



fair to good condition. Settlement of cover stone and a portion of 

 the north shore arm of the breakwater (Figure 158, Section II) was 

 observed and has subsequently been repaired by the placement of 

 additional stone. Stone settlement of portions of the entire south 

 pier were observed and scheduled for replenishment. 



1985 The structures are currently considered to be in good condition. 



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