A roving bridge, changeline bridge, turnover bridge, or snake bridgeWilliam George Victor Balchin, ed., ''The Country Life Book of the Living History of Britain'', 1983, , p. 109 is a bridge over a canal constructed to allow a horse towing a boat to cross the canal when the

towpath A towpath is a road or trail on the bank of a river, canal, or other inland waterway. The purpose of a towpath is to allow a land vehicle, beasts of burden, or a team of human pullers to tow a boat, often a barge. This mode of transport ...

changes sides. This often involved unhitching the tow line, but on some canals they were constructed so that there was no need to do this by placing the two ramps on the same side of the bridge (see middle photo), which turned the horse through 360 degrees. On the

Macclesfield Canal The Macclesfield Canal is a canal in east Cheshire, England. There were various proposals for a canal to connect the town of Macclesfield to the national network from 1765 onwards, but it was not until 1824 that a scheme came to fruition. There ...

this was achieved by building spiral ramps and on the

Stratford-upon-Avon Canal The Stratford-upon-Avon Canal is a canal in the south Midlands of England. The canal, which was built between 1793 and 1816, runs for in total, and consists of two sections. The dividing line is at Kingswood Junction, which gives access to the ...

and others by constructing roving bridges of iron in two

cantilever A cantilever is a rigid structural element that extends horizontally and is supported at only one end. Typically it extends from a flat vertical surface such as a wall, to which it must be firmly attached. Like other structural elements, a canti ...

ed halves, leaving a slot in the middle for the tow rope. This was also called a split bridge. For cost reasons many ordinary Stratford bridges were also built in this way as they had no towpath. Bridges were also necessary at canal junctions and where the towpath was interrupted by side arms. These are strictly speaking side bridges, but they are often referred to as roving bridges. Well-known ones occur at

Hawkesbury Junction Hawkesbury Junction or Sutton Stop () is a canal junction in England, at the northern limit of the Oxford Canal where it meets the Coventry Canal, near Hawkesbury Village, Warwickshire, between Bedworth and Coventry. The alternative name, Su ...

and

Haywood Junction Haywood Junction (), or Great Haywood Junction, is the name of the Junction (canal), canal junction where the Staffordshire and Worcestershire Canal terminates and meets the Trent and Mersey Canal near to the village of Great Haywood, Staffordsh ...

. The

Birmingham Canal Navigations Birmingham Canal Navigations (BCN) is a network of canals connecting Birmingham, Wolverhampton, and the eastern part of the Black Country. The BCN is connected to the rest of the English canal system at several junctions. It was owned and oper ...

has many examples, mainly of cast iron, which took the towpaths across factory arms. The ramps of the bridge are typically studded with alternating rows of protruding bricks to prevent the feet of the horse from sliding. The bridge may be constructed of cast iron (particularly in industrial areas) or of more conventional brick or stone.

References

* Water transport infrastructure Canals Bridges by mode of traffic {{UK-canal-stub

See also

References