alney island arch bridge aust severn powerline crossing avonmouth bewdley bridgnorth bristol bristol channel building cardiff chepstow circular segment coalport canal coombe hill canal cound brook droitwich canal ellipse english bridge english heritage geographic coordinate system gloucester gloucester and sharpness canal gloucestershire great britain herefordshire and gloucestershire canal ironbridge jean-rodolphe perronet list of crossings of the river severn llanidloes monmouthshire neuilly-sur-seine newport nonbuilding structure powys river clyde river great ouse river nene river severn river spey river tay river teme river tern river thames river trent river tweed river usk river vyrnwy river wye second severn crossing severn bridge severn estuary severn tunnel severn crossing shrewsbury shropshire soffit somerset staffordshire and worcestershire canal stourport-on-severn stroudwater navigation tewkesbury thames and severn canal the iron bridge thomas telford vale of glamorgan welshpool worcester worcester and birmingham canal worcestershire