Imperial

Metric

Main Span

3300 feet

1006m.

Side Span North

1340 feet

408m.

Side Span South

1340 feet

408m.

North Viaduct

842 feet

257m.

South Viaduct

1437 feet

438m.

Total Length between abutments

8259 feet

2517m.

Clearance under main span

150 feet

46m.

Carriageways

Dual two lane carriageways

Lane width

12 feet

3.66m.

Cycle paths

2 nos. x 9 feet wide

2 nos. x 2.74m. wide

Footways

2 nos. x 6 feet wide

2 nos. x 1.83m. wide

Total deck width

108 feet

33m.

Road level at side towers

153 feet above M.W.L.

47m. above M.W.L.

Road level at mid span

208 feet above M.W.L.

63m. above M.W.L.

Tower height above M.W.L.

512 feet

156m.

Main cable diameter

2 feet

610mm.

Wires in each main cable

11,618 wires in each

Diameter of wires

0.196 ins.

5 mm.

Ultimate tensile strength of wire

100/110 tons per sq. ins.

Total length of wire in 2 cables

30,800 miles

49,570 km.

Maximum anchor span cable load under dead load only

12,100 tons

12,292 tonnes

Total weight of wire

7,600 tons in two cables

7,720 tonnes in two cables

Diameter of suspenders

2.25 ins. on side span

1.875 ins. on main span

57 mm. on side span

47 mm. on main span

Longest suspender

296 feet

90m.

Shortest suspender

8 feet

2.4m.

Maximum suspender loads

220 tons side span

173 tons main span

224 tonnes side span

176 tonnes main span

Total weight of steel in bridge construction

39,000 tons

39,619 tonnes