Table 39 



Rock Hall Harbor Breakwaters 



Rock Hall, Maryland 



Baltimore District 



Date(s) Construction and Rehabilitation History 



1939 Two breakwaters were constructed with 8,400 tons of stone. Lengths 



of the breakwaters were 850 ft and 700 ft east and west, respectively 

 (Figure 51). Elevations of the breakwaters were +4.0 ft mlw, with a 

 single capstone, crown width of 4.0 ft, and side slopes of 1V:1.5H. 



1964 Repairs were made on both breakwaters to restore them to original 

 design geometry. The east breakwater was in good condition with 

 crest subsidence of less than 0.5 ft. The majority of the repairs 

 were made on the west breakwater. The landward 80 ft had subsided up 

 to 2.0 ft, the seaward 50 ft had subsided to mlw, and the adjacent 

 380 ft had subsided 1.0 to 2.5 ft. The landward ends of both break- 

 waters were repaired with 250- to 500-lb stone. A 40-ft extension 

 was added to the west breakwater (Figure 51), and the outer 220 ft, 

 including the extension, were repaired with 1,000 to 2,000-lb cover 

 and core stone. The adjacent 260 ft were raised by filling the 

 existing section with additional core stone. 



1982 Extensive rehabilitation was done to both breakwaters due to wave 



transmission and overtopping causing excessive wave heights (greater 

 than 4.0 ft) in the inner harbor. Estimated cost of the rehabi- 

 litation was $1,800,000 and required over 27,000 tons of stone. 

 Crown elevation was raised to +7.0 ft mlw, crown width was widened 

 to 8.0 ft with three capstones, and side slopes remained 1 V : 1 . 5H 

 requiring 12,400 tons of stone. The west breakwater was extended 

 to 1,100 ft requiring 14,800 tons of stone. Cover stone used for 

 rehabilitation ranged from 2,300 lb at the trunk to 2,800 lb at the 

 head. Cross sections and location of the rehabilitation are shown 

 in Figure 52. 



1986 No further repair or maintenance information has been found. 



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