Table 72 



Harbor Beach Breakwaters 



Harbor Beach, Michigan 



Date(s) Construction and Rehabilitation History 



1874- Construction of a 1 ,204-f t-long north breakwater, a 4,716-f t-long 

 1885 main breakwater, and a 1 ,956-f t-long south breakwater (Figure 192) 

 was completed during this period. The breakwaters were constructed 

 with stone-filled timber cribs which ranged from 16 to 38 ft in width 

 (Figure 193) , 



1905- The main breakwater was capped with a stone and concrete super- 

 1909 structure (Figure 193, Cross Sections D-D and E-E) . The super- 

 structure included a parapet that had a crest el of +16.5 ft Iwd. 



1911- The north breakwater was capped with a concrete superstructure (Fig- 

 1912 ure 193, Cross Sections A-A and B-B) . The breakwater crest el was 

 established at +8.0 ft Iwd. 



1916- The south breakwater was capped with a concrete superstructure 

 1917 (Figure 193, Cross Sections F-F through I-I) . The crest el of most 

 of the structure was +8.0 ft Iwd, but the northern end of the break- 

 water (Cross-Section F-F) included a parapet with an el of +14 ft 

 Iwd. 



1916- Riprap was placed on the lakeside of the main breakwater (Fig- 

 1919 ure 193, Cross Sections D-D and E-E). It was placed on a 1-V:1.5-H 



slope with a crest ranging from about +3 ft Iwd (Cross Section D-D) 



to +6.5 ft Iwd (Cross Section E-E). 



1921 Riprap was placed on each side of the south breakwater (Figure 193, 

 Cross Sections F-F through I-I) . The crest of the riprap on the 

 lakeside was +8.0 ft Iwd, and on the harbor side it was at an el of 

 +3.5 ft Iwd. 



1925- Riprap was placed on the lakeside of a portion of the north break- 

 1926 water (Figure 193, Cross Section B-B) to an el of about +3.5 ft Iwd. 



1966 Rehabilitation of the south end of the main breakwater (Figure 192, 

 Cross Section E-E) was performed. Work consisted of replenishing 

 stone fill and repairing cracks in the substructures. Cost of the 

 repairs was about $172,000. 



1971 Rehabilitation of portions of the south breakwater (Figure 192, Cross 

 Sections F-F through H-H) was completed. Riprap protection which 

 included a total of approximately 38,500 tons of stone (ranging from 

 6 to 15 tons each) was performed for about $676,000. 



1975 Riprap was replenished along portions of the main breakwater. 



(Continued) 

 294 



