The river is crossed by an old farm access bridge at Pont y Gwaith, with a single span of and a width of . It carries a date plaque stating it was built in 1811, but that probably refers to an earlier wooden bridge, and the main arch was rebuilt in 1993. The river turns to the east to flow around the southern edge of Treharris, and then in a large loop around higher ground on which is Goitre-Coed. Three listed bridges cross the loop. The first was built by Isambard Kingdom Brunel in 1840-41, and consists of six arches on a slight curve. It carried the single track Taff Vale Railway, but was doubled in width within 20 years, to enable it to carry twin tracks. The second was part of the Merthyr Tramroad, and was built in 1815 after the original wooden bridge collapsed into the river when a train crossed it. It has a span of and is one of the earliest railway bridges, but was in poor condition in 2002, as is the Victoria Bridge, which was also rebuilt in 1815.