Canals And Inland Waterways, Bridges, aqueducts, and tunnels for waterways

Canals must frequently cross over or under roads and railways, rivers, and other canals. These crossings are made by a variety of bridges, sometimes carrying the road or railroad, sometimes carrying the canal. Most are fixed, though movable bridges are also used. On the Weaver River in England, four movable bridges, carrying main roads across the waterway, swing on