The predecessor of the Whirlpool Rapids Bridge was the Niagara Falls Suspension Bridge, which carried foot and rail traffic.
That bridge, opened in 1855, was most notable for being the world's first working railway suspension bridge and for being the bridge abolitionists running the Underground Railroad used to get slaves to freedom in Canada.
By the late 1800s, the suspension bridge was becoming outdated for railroad needs.
The weight of trains in North America had greatly increased by the mid-1890s.
Larger and more powerful locomotives were required to pull cars that handled an increasing number of passengers and goods; compared to the 23-short-ton (21 t) locomotives crossing the bridge in the 1850s, 170-short-ton (150 t) locomotives were the common engines 40 years later.
The weight of these trains exceeded the specifications of the Suspension Bridge, and the bridge companies took the opportunity to review and request the replacement of the bridge.

Civil engineer Leffert L. Buck, who had been hired to maintain the Suspension Bridge, was selected to design the replacement bridge.
He settled for a bridge of the arch design.
At that time, arch bridges were the new models for railway bridges and were more cost-efficient than suspension bridges.
Buck built the new bridge around and below the Suspension Bridge, replacing it a piece at a time beginning on April 9, 1896.
 His plan allowed bridge traffic—train and pedestrian—to continue without disruption.
 By August 27, 1897, the last pieces of the Suspension Bridge were dismantled, leaving the Lower Steel Arch Bridge—later renamed the Whirlpool Rapids Bridge—in its stead.

Over the years the New York Central Railroad, Great Western Railway, Erie Railroad, Canadian National Railway, and Amtrak have used the bridge.
In November 2009, the bridge was extensively refurbished: repairing and replacing the catwalk and some of the steel beams and rivets, sandblasting, and a paint job were among the major maintenance tasks undertaken.
Amtrak took over maintenance responsibility of the rail deck from Canadian National (CN) in late 2012.
Currently the Maple Leaf train service, jointly operated by Amtrak and Via Rail, is the only train to use the bridge; CN routes freight over the International Railway Bridge at Fort Erie, Ontario–Buffalo, New York instead.

Just upstream is the disused Michigan Central Railway Bridge which with its predecessor the Niagara Cantilever Bridge competed for rail traffic with the Whirlpool Rapids Bridge.
The predecessor of the Whirlpool Rapids Bridge was the Niagara Falls Suspension Bridge, which carried foot and rail traffic. That bridge, opened in 1855, was most notable for being the world's first working railway suspension bridge and for being the bridge abolitionists running the Underground Railroad used to get slaves to freedom in Canada. By the late 1800s, the suspension bridge was becoming outdated for railroad needs. The weight of trains in North America had greatly increased by the mid-1890s. Larger and more powerful locomotives were required to pull cars that handled an increasing number of passengers and goods; compared to the 23-short-ton (21 t) locomotives crossing the bridge in the 1850s, 170-short-ton (150 t) locomotives were the common engines 40 years later. The weight of these trains exceeded the specifications of the Suspension Bridge, and the bridge companies took the opportunity to review and request the replacement of the bridge.
Civil engineer Leffert L. Buck, who had been hired to maintain the Suspension Bridge, was selected to design the replacement bridge. He settled for a bridge of the arch design. At that time, arch bridges were the new models for railway bridges and were more cost-efficient than suspension bridges. Buck built the new bridge around and below the Suspension Bridge, replacing it a piece at a time beginning on April 9, 1896.  His plan allowed bridge traffic—train and pedestrian—to continue without disruption.  By August 27, 1897, the last pieces of the Suspension Bridge were dismantled, leaving the Lower Steel Arch Bridge—later renamed the Whirlpool Rapids Bridge—in its stead.
Over the years the New York Central Railroad, Great Western Railway, Erie Railroad, Canadian National Railway, and Amtrak have used the bridge. In November 2009, the bridge was extensively refurbished: repairing and replacing the catwalk and some of the steel beams and rivets, sandblasting, and a paint job were among the major maintenance tasks undertaken. Amtrak took over maintenance responsibility of the rail deck from Canadian National (CN) in late 2012. Currently the Maple Leaf train service, jointly operated by Amtrak and Via Rail, is the only train to use the bridge; CN routes freight over the International Railway Bridge at Fort Erie, Ontario–Buffalo, New York instead.
Just upstream is the disused Michigan Central Railway Bridge which with its predecessor the Niagara Cantilever Bridge competed for rail traffic with the Whirlpool Rapids Bridge.
Whirlpool Rapids Bridge