Table 48 (Concluded) 



Date(s) Construction and Rehabilitation History 



1975 Stone was placed along the lakeward end of the north breakwater (Fig- 

 ure 130, Section A) in areas of settlement and along the lakeward 

 end of the south breakwater (Figure 130, Section D) for protection 

 against wave and ice action. 



1979- The entire north pier (Figure 130) was removed, and the structure was 



1980 replaced with a rubble-mound pier (Figure 131) . The crest el of the 

 pier was +8.5 ft Iwd, and side slopes were 1V:2.5H on the channel 

 side and 1V:1.5H on the lakeside. Approximately 1,000 tons of stone 

 was placed along the navigation light at the head of the north break- 

 water. Riprap stone also was placed along the south breakwater head. 



1981 Approximately 510 tons of riprap stone was again placed at the head 

 of the north breakwater around the navigation light (Figure 130) . 

 Riprap also was again placed around the head of the south breakwater. 

 Fill stone in the entire south pier (Figure 130, Sections N, 0, and 

 P) was replenished, and the structure was recapped with concrete. 



1982 The stone at the head of the west breakwater (Figure 130) again was 

 washed out, and approximately 1020 tons of 8- to 16-ton riprap stone 

 was placed around the navigation light. Also added were 50 tons of 

 3- to 10-in. fill stone, 247 tons of 50- to 300-lb core stone, and 

 312 tons of 500-lb to 3-ton riprap to the north breakwater (Fig- 

 ure 130, Section A). Repairs to the head of the south breakwater 

 (Section C) included the addition of 324 tons of 500-lb to 3-ton rip- 

 rap as core stone along the lakeside face and 1,038 tons of 3- to 

 16-ton riprap around the breakwater head. In addition, 800 tons of 

 500-lb to 3-ton riprap stone was placed as toe protection along the 

 channel side of the south pier. 



1983 The north pier (Figures 130 and 131) was repaired with the placement 

 of larger cover stone, and 8- to 12-ton riprap stone was placed 

 around the navigation light at the head of the west breakwater 

 (Figure 130). 



1984 Major riprap placement at the south breakwater (Figure 130, Sec- 

 tions C, D, and E) for protection against waves and ice action was 

 completed which involved approximately 86,770 tons of 10- to 26-ton 

 cover stone (with stones as large as 49 tons in some areas) . This 

 placement encompassed the south breakwater head and both the lake and 

 harbor sides. The stone was placed to an el of +8.0 ft Iwd. 



1986 Reconstruction of the head of the north breakwater was initiated and 

 involved (Figure 130) removal of the existing cover and core stone 

 and the placement of a steel sheetpiling with a concrete cap break- 

 water head structure. Also initiated was rehabilitation of the south 

 breakwater concrete caps which are extensively spalled with large 

 pieces cracked and broken off causing a hazard to the public. After 

 these repairs, the structures will be in good condition. An aerial 

 view of Muskegon Harbor structures is shown in Figure 133. 



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