Table 19 



Rockport Harbor Breakwaters 



Rockport, Mass. 



Date(s) Construction and Rehabilitation History 



1836- Two breakwaters of rubble stone were built, one 900 ft easterly from 

 1839 Bearskin Neck and the other about 200 ft northerly from Norwoods 



Head, leaving an entrance channel 220 ft wide between their low-water 

 lines (Figures 21 and 22). Construction costs totaled $69,200. 



1900- By ;900 the breakwaters had deteriorated to the point that they no 

 1905 longer afforded the necessary harbor protection. From 1903 to 1905 

 repairs were made by placing heavy rubble stone to a height of 

 +18.5 ft mlw, a top width of 20 ft, and slopes of 1V:2H and 1V:1H on 

 the sea and harbor sides, respectively. A total of 11,050 tons of 

 stone was used, and principal rocks were removed from the harbor for 

 a total cost of $22,000. 



1958- Inspections indicate the breakwaters were in good condition. Repairs 

 1967 may have occurred in 1952 and 1956. (Information on repairs during 



the 1950's was not found in the annual reports to the Chief of 



Engineers. ) 



1970 Repairs were made at the seaward end of Bearskin Neck breakwater 



where stone had been displaced from a lower portion of the head side 

 slope. 



The existing head section cover layer had a fairly smooth appearance 

 due to careful placement and addition of concrete grout. Also, iron 

 tie rods had been placed, connecting individual cover stone through- 

 out this section. The remainder of the breakwater is composed of 

 500-lb to 5-ton stone with an outward appearance typical of rubble- 

 mound structures. The 45-ft-long repair section was located mostly 

 on the harbor side quadrant of the head. Stone weighing 5 to 8 tons 

 was placed at a 1V:2H side slope. The repairs were made for a lump 

 sum of $25,500. 



1973 The seaward end of Bearskin Neck breakwater was repaired with 5- to 

 8-ton stone. The stone was placed on two sections, one totaling 

 55 ft in length on the seaside head and trunk and the other totaling 

 50 ft in length, the same area repaired in 1970. The repairs con- 

 sisted of adding stone to void areas such that the resulting side 

 slopes were fairly uniform. Lump sum cost of the repair was $28,700. 



1977- Repairs were made to the seaward 100 ft of Bearskin Neck breakwater. 



1978 Existing displaced stone was reset throughout this section and, to 

 complete the repairs, approximately 1,600 tons of new 4- to 8-ton 

 stone were used. The repair geometry had a +18.5 ft mlw crown eleva- 

 tion, a crown width varying from 18 to 28 ft (widest at seaward end), 

 and side slopes varying from 1V:2.5H to 1V:1.5H (steepest at 



(Continued) 



44 



