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).
Built/repaired/rebuilt: 1486-7; 1544; 1580; 1694
Reported broken down: 1551;1611-13; 1612-30; 1694;
There are various references to the construction, repair and collapse of the bridges(possibly due to flooding) with ferries or ford crossings reinstituted after each collapse.
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).
Strype, in 1694, states of Monoux ‘he made a Causeway over Walthamstow Marsh to Lock Bridge over the River Lee for the conveniency of Travellers from those Parts to London, and left wherewith to continue and keep it in repair; but that also is lost and the Ruins now only to be seen.’
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 Archbishop granted a licence dated July the 24th with the full consent of Richard Withipol, Vicar of Walthamstow in Essex, to George Monoux Alderman of London and Thomas his son to have the sacrament administered in his chapel or oratory in his house De Moones now a farm near Higham hill in the said parish of Walthamstow indulging therein to the wife of the said Thomas to be purified or churched in the same chapel. I the rather mention this that it may serve to recal the memory of that pious and charitable citizen and draper Sir George Monoux; who built the fair steeple of that parish church and allowed a salary for ever for ringing the great bell at a certain hour in the night and morning the winter half year. He built also the north aisle of the said church in the glass windows whereof is yet remaining his coat of arms In the chancel his body was interred under a fair altar monument yet standing In the church yard he founded an hospital and free school and very liberally endowed it; though now the endowments are sadly diminished. He also made a causeway over Walthamstow marsh to Lockbridge over the river Lee for the conveniency of travellers from those parts to London and left wherewith to continue and keep it in repair but that also is lost and the ruins now only to be seen.' (2)
 The Story Of A Walthamstow Worthy His Foundations And Benefactions, George F. Bosworth, The Walthamstow Antiquarian Society. 1916.
(2) Memorial of the Most reverend father in God Thomas Cranmer, Sometime Lord Archbishop of Cantebury vy John Stype (Published 1812)