Table 47 



Upper Thorofare Breakwaters 



Deal Island, Maryland 



Baltimore District 



Date(s) Construction and Rehabilitation History 



1934 Two stone breakwaters were constructed with 3,650 tons of stone at an 

 estimated cost of $9,000. The north breakwater was 410 ft long. The 

 south breakwater was 310 ft long. The seaward ends were 180 ft apart 

 (Figure 60). Crest elevations were +7.0 ft mlw, except the landward 

 142 ft of the south breakwater which was from +5.0 to +6.5 mlw. 

 Crown width was 4.0 ft, and side slopes were 1:1. 



1966 Sand had accumulated around one-half to two-thirds of the landward 

 end of the north breakwater. The south breakwater had an average 

 subsidence of 2.0 ft and was repaired to raise the elevation to 

 +7.0 ft mlw. Crown width was 4.0 ft, and side slopes were 1 V : 1 . 5H . 



1981 A survey indicated the south breakwater was in excellent condition, 

 although the midsection appeared to have subsided 1.0 ft. The north 

 breakwater was almost completely surrounded by sand, and future 

 shoaling of the channel was foreseen. The north breakwater appeared 

 to have subsided 1.0 ft from the original design elevation. 



1986 No further repair or maintenance information has been found. 



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