T 



13.8'j 



Slope I on 1.3 

 L.W. D 



10.2' 





■TOE STONE 



Slope I on 1.3 



SECTION X 



(BUILT 1929 - 1938) 



Deck stone- Minimum weiglit 5 tons 

 "a" Stone Minimum weigint 3 tons, not less ttion 50% 



5 tons or more. 

 ' B" Stone Minimum weight 150 pounds, 

 'c" Stone Not less ttion 35% 75 pounds or more, not 



more ttian 3% less than one pound. 

 Toe Stone Minimum weight 7 tons 



Reinforcing bars 



BL/ICK ROCK CANAL 

 d L.W. D. El. 568.6 



NIAGARA 



RIVER 

 El. 563.6 



BLACK ROCK 

 CANAL 

 El. 568 6 



SECTION Y 



built: sub-structure I869-I892 



SUPER -STRUCTURE 1928-1929 



SECTION Z 



'BUILT 1822 - 1825 \ 

 ■ REBUILT 1837 - 1937/* 



TYPICAL SECTIONS OF BIRD ISLAND PIER 



Figure 272. Typical structure cross sections. 

 Black Rock Channel, New York 



398 



