London Bridge Dimensions: Historic vs. Current

Measurements depend entirely on which London Bridge you're asking about. The site has hosted bridges of vastly different proportions.

Medieval Stone Bridge (1209–1831)

• Length: ~900 ft (274 m) — 19 irregular arches
• Width: ~20–26 ft (6–8 m) between parapets (narrowed by buildings)
• Roadway: ~12 ft (3.7 m) — barely two carts could pass

Rennie's Granite Bridge (1831–1967)

• Length: 928 ft (283 m) — 5 semi-elliptical arches, 150 ft (46 m) each
• Width: 49 ft (15 m) — wide for its era
• Height: ~60 ft (18 m) above high water

Current Box-Girder Bridge (1973–present)

• Length: 928 ft (283 m) — three spans (center 340 ft / 104 m)
• Width: 62 ft (19 m) — 6 traffic lanes + 2 pedestrian walkways
• Height (to parapet): ~140 ft (43 m) above mean low water
• Clearance (closed): 29 ft (8.8 m) at high tide
• Clearance (bascules open): Unlimited (for rare tall ships)

Key Takeaway

The length has been remarkably consistent (~900–930 ft) because the river width at the lowest bridging point hasn't changed. But width, height, and structural depth have grown with each generation's traffic demands and engineering capacity.