E10: no postcode below a spring high tide, the lowest 0.8 m above it

No postcode in E10 stands below an ordinary spring high tide at London Bridge. The lowest, E10 5BY, is 0.8 m above it and 0.7 m below the tide of 1 February 1953.
- Ground at eight in ten of its postcodes: between 7.0 m and 21 m, measured from Ordnance Datum; the middle one stands at 13 m.
- 2 of 607 stand lower than the 1953 tide (5.41 m).
- One lies in the Environment Agency's Flood Zone 3 from the sea, mapped without defences.
- In Waltham Forest.