Table 29 



Hyannis Harbor Breakwater 



Hyannis Harbor, Mass. 



Date(s) Construction and Rehabilitation History 



1827- The breakwater (Figure 32, plan view) was constructed between 1827 

 1936 and 1837 and rebuilt between 1870 and 1882. The inner leg of the 

 breakwater, about 2,250 ft long, was built by the State of 

 Massachusetts. The 1 , 170-ft-long outer leg of the breakwater was 

 built and maintained by the Federal government. The rebuilt cross- 

 section had a 10-ft crown width at +10 ft mlw and may have been of 

 cut stone construction since the side slopes were nearly vertical. 

 Minor repairs were made in 1936. 



1950 The outer 1 , 170-ft-long leg of the breakwater and adjacent 10 ft of 

 state breakwater were repaired with 1- to 6-ton stone. The repair 

 geometry consisted of a 10-ft crown width at +10 ft mlw and 1 V: 1H 

 side slopes. A total of 3,224 tons of stone was placed for a cost of 

 $29,200. Prior to the repairs, existing crown elevations varied from 

 +5 to +10 ft mlw. The State portion of the breakwater was considered 

 to be in poor condition. 



1961 The outer leg of the breakwater was repaired from 0+00 to 7+80 and 



10+75 to 11+15 (breakwater bend at 0+00, seaward end at 11+70). The 

 repair section consisted of an 8-ft crown width at +10 ft mlw, 

 1V:1.5 side slopes, and 2- to 7-ton armor stone. Before the repairs, 

 crown elevations were from +5 to +10 ft mlw. The repair costs were 

 $129,800 using a total of 13,588 tons of stone. 



1966- Inspections indicated the Federal portion of the breakwater was in 

 1974 fair condition. 



1982- Yearly visual inspections indicated the breakwater was in good 

 1986 condition. 



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