The span for a tower Bride is centre to centre distance between the pulleys at both ends of towers
Span 57
Each of the two towers on the Tower Bridge is 213 ft (65 m) high. The central span of the bridge is 200 ft (61 m) between the towers.
70ft
span bridge
A bridge's span is the length that crosses the gap.
The Tower Bridge is a combined bascule and suspension bridge.
Tower Bridge is east of London Bridge.
The span is the distance between supports. The sum of the span lengths is the bridge length.
Tower Bridge is a combined bascule and suspension bridge.
I think you probably mean "bridge span" rather than "spam bridge." A bridge span is the part of the bridge between its supports.
The longest suspension bridge in the UK is the Humber Bridge which has a total length of 2,220m and a span length of 1,140m (making it the fifth largest span for a suspension bridge in the world). Please see the related links and question.
Tower Bridge is adjacent to the Tower of London on its southeast corner.