It was used as scaffolding for John A. Roebling 's double decker railroad and carriage bridge ( 1855 ) .
Ellet 's Niagara Falls Suspension Bridge ( 1847 -- 48 ) was abandoned before completion .
Niagara Falls Suspension Bridge was used as scaffolding for John A. Roebling 's double decker railroad and carriage bridge ( 1855 ) .
Ellet 's Niagara Falls Suspension Bridge ( 1847 -- 48 ) was abandoned before completion .