Slateford Aqueduct

Slateford Aqueduct is an eight-arch bridge that carries the Union Canal across the Water of Leith using a cast-iron trough supported by masonry. The structure spans the valley with stone arches that hold the water-filled channel above the river below.

Hugh Baird completed this structure in 1822 as part of the Union Canal project linking Edinburgh to Glasgow. The design applied engineering methods proven in earlier canal projects and represented a major achievement in bridge construction of that era.

The structure shows how engineers in the 1800s solved the problem of moving boats across a valley by building a bridge that holds water. Today you can walk along it and see how this engineering solution still works as people use the canal.

You can reach it by walking along the northern towpath, which connects to the wider canal network for longer walks. The best time to visit is in dry weather when the walking surface is safer and more comfortable.

The structure solved a tricky engineering puzzle by holding a water-filled channel high enough for boats to float across while keeping the water inside the iron trough. This design required the iron container to withstand both the weight and pressure of the water and cargo.