Table 57 



Greillckville (formerly Traverse City) Harbor Breakwaters 



Traverse City, Michigan 



Date(s) Construction and Rehabilitation History 



1950 Construction of a 1 ,217-f t-long steel sheet-pile breakwater (Fig- 

 ures 160 and 161, Sections A and B) was completed. The crest el of 

 the structure was +7.0 ft Iwd. 



1951 A 35.8-ft-diameter steel sheet-pile cell was constructed at the head 

 of the breakwater (Figures 160 and 161, Section B-B) . The cell was 

 stone filled and capped with concrete at an el of +7.0 ft Iwd. 



1966 Construction of east and west rubble-mound breakwaters (Figure 160) 

 was completed. Steel sheet-pile cells were installed on the channel 

 ends of the breakwaters (Figure 160). The cells were 19.1 ft in 

 diameter and had a crest el of +7.0 ft Iwd (Figure 161). They were 

 stone filled and capped with concrete. The east and west breakwaters 

 had crest els of +8.0 ft Iwd and crest widths of 8 ft. Cover stone 

 ranged from 1 to 2 tons, and the breakwaters had 1-V:2-H side slopes 

 (Figure 161). 



1976 Stone was placed into a washed out area of the east end of the east 

 breakwater (Figure 160). 



1979 Stone was placed along both sides of the steel sheet-pile breakwater 

 (Figure 160, Sections A and B) to reduce scouring and maintain struc- 

 ture stability. 



1985 A site inspection of the breakwaters indicated that the rubble-mound 

 east and west breakwaters were deteriorating slightly, with stones 

 cracking and breaking into smaller pieces as a result of the low- 

 grade limestone used in initial construction. Rehabilitation with 

 sounder and slightly larger cover stones has been recommended. The 

 breakwaters, however, were considered to be in good stable condition. 

 An aerial photo of Greillckville Harbor breakwaters is shown in 

 Figure 162. 



1986 Traverse City Harbor was renamed "Greillckville Harbor," on 



17 October 1986, in the 99th Congress, 2nd Session, Title XIII, 

 Section 1304. 



253 



