Table 55 



Frankfort Harbor Structures 



Frankfort, Michigan 



Date(s) Construction and Rehabilitation History 



1868- Construction of the south pier (Figure 153, Sections N-1, N, and 0) 

 1873 was completed during this time frame. The lakeward end of the pier 

 was constructed with 20-ft-wide stone-filled timber cribs (Fig- 

 ure 154, Sections N and N-1). The shoreward portion (Section 0) was 

 composed of woodpilings spaced about 21 ft apart and filled with 

 stone and sand. 



1870- Construction of the shoreward 603-ft length of the north pier 

 1879 (Figure 153, Sections L-1 and L) was completed. The pier was a 20- 

 ft-wide stone-filled timber crib structure (Figure 154, Sections L-1 

 and L) . 



1889- A 200-ft-long extension of the north pier was completed (Figure 153, 

 1895 Section K) . The extension consisted of a stone-filled timber crib 

 structure that was 24 ft in width (Figure 154, Section K) . 



1928- Construction of the north and south breakwaters (Figure 153) was 

 1932 completed during this period. The lakeward portions of the struc- 

 tures consisted of stone-filled concrete breakwaters (Figure 156, 

 Sections A, B, and C) . The crest widths were slightly more than 7 ft 

 with els of +7.1 ft Iwd. The outer ends of the breakwaters each in- 

 cluded 2 rectangular caissons for a distance of 54 ft. The shoreward 

 ends of the breakwaters were woodpilings spaced from 11 to 14 ft 

 apart (Figures 155 and 156, Sections D, E, F, G, H, I, and J). The 

 structures were stone filled and capped with concrete and stone 

 superstructures. The north and south breakwaters ranged from 14 to 

 17 ft in width and had crest els of +7.1 and +7.3 ft Iwd, 

 respectively (Figures 155 and 156) . 



1933- A total of 71,496 tons of riprap was placed along the sides of the 

 1963 lakeward ends of the north and south breakwaters (Figure 156, Sec- 

 tions A, B, and C) . 



1934 The north and south piers (Figure 153) were capped with concrete and 

 stone superstructures (Figure 154, Sections K, L, L-1, N, N-1, and 

 0) . The piers ranged from 23 to 27 ft in width with crest els of 

 +7.0 ft Iwd. 



1950 The shoreward end of the south pier (Figure 153, Section 0) was 



reconstructed by the installation of steel sheetpiling on the channel 

 side (Figure 154, Section 0). The void between the existing struc- 

 ture and the new steel sheetpiling was filled with stone and capped 

 with concrete at an el of +7.0 ft Iwd. 



1953 The lakeward 36 ft of the south pier (Figure 153, Section N-1) was 

 repaired by encasing it in steel sheetpiling (Figure 154, Sec- 

 tion N-1). The new width of the pier was 27 ft. Voids between the 



(Continued) 



243 



(Sheet 1 of 3) 



