A causeway of 12 timber bridges from Leyton, across the Shortland Sewer towards the ferry, ford and bridge crossings at Lea Bridge.
The section crossing the Lea at Lea Bridge is referred to as 'Lockbridge', which may be a reference to some form of lock gate or weir with a timber bridge above. The eastern section of the causeway is referred to as Blackbridge�(which crossed the Shortlands Sewer west of Hemstall Green).
The upkeep and repair has been associated at different times with Lord Wentworth, lord of the manor of Hackney, Sir George Monoux (d 1544) and Lady Laxton (in 1580).
Besides constructing this causeway, Monoux built two bridges called the ‘three arches’ and the ‘eight arches’, which carried the flow of water beneath the Lea Bridge Road.
Stype provides a portrait of Monoux and his charitable works.
 The Story Of A Walthamstow Worthy His Foundations And Benefactions, George F. Bosworth, The Walthamstow Antiquarian Society. 1916.