Prior to 1826, the bridge over the River Parrett, just below the junction with the River Tone, consisted of three arches, each only a little wider than the barges which used the river. They restricted the flow of water in times of flood, and made navigation difficult. The bridge was highlighted in a report made by William Armstrong in 1824, as a factor which would prevent the River Tone Navigation competing with the new Bridgwater and Taunton Canal, then being built. An Act of Parliament was obtained in 1824 by the Turnpike Commissioners, authorising the construction of a new bridge and the removal of the old. A design for a 70-foot (21 m) single-span bridge in cast iron was dropped because of the cost of cast iron at the time, and instead a stone bridge was built and completed in 1826. It is the longest single span masonry road bridge in the county, and was the last toll bridge in Somerset, before being 'freed' in 1946. Just below the bridge there was a shoal of rocks and stones, which was also mentioned in Armstrong's report, but no action was taken to remove it. Except on spring tides, Burrowbridge was the normal upper limit for barges riding the incoming tide. Above here, horses were used to pull the boats, either towards Langport or along the River Tone towards Taunton.