| 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. |
