Length
of arch span 
503
metres 
Height
of top of arch 
134
metres above mean sea level 
Height
to top of aircraft beacon 
141
metres above mean sea level 
Width
of deck 
49
metres 
Clearance
for Shipping 
49
metres 
Height
of Pylons 
89
metres above mean sea level 
Base
of each abutment tower 
68
metres across and 48 metres long (two pylons rest on each
abutment tower) 
Total
length of bridge 
1149
metres including approach spans 
Bearing
Pins 
Each
of the four pins measures 4.2 metres long and 368 millimetres
in diameter 
Thrust
on bearings 
Under
maximum load approximately 20,000 tonnes on each bearing 
Number
of rivets 
Approximately
6,000,000 
Largest
rivet 
Weighed
3.5kilograms and was 395 millimetres long 
Longest
Hanger 
58.8
metres 
Shortest
Hanger 
7.3
metres 
Total
weight of steelwork 
52,800
tonnes including arch and mild steel approach spans 
Weight
of arch 
39,000
tonnes 
Rock
excavated for foundations 
122,000
cubic metres 
Concrete
used for bridge 
95,000
cubic metres 
Granite
facing used on pylons & piers 
17,000
cubic metres 
Allowance
for deck expansion 
420
millimetres 
Allowance
for arch expansion 
The
arch may rise or fall 18 centimetres due to heating or cooling

Number
of panels in arch 
28,
each 18.28 metres wide 
Record
tonnage erected 
589
tonnes of steelwork was erected on the arch in one day on
26 November 1929 
Paint
required 
272,000
litres of paint were required to give the Bridge its initial
three coats. 