The Cromford Canal ran from Cromford to the Erewash Canal in Derbyshire, England with a branch to Pinxton. Built by William Jessop with the assistance of Benjamin Outram, its alignment included four tunnels and 14 locks. From Cromford it ran south following the contour line along the east side of the valley of the Derwent to Ambergate, where it turned eastwards along the Amber valley. It turned sharply to cross the valley, crossing the river and the Ambergate to Nottingham road, by means of an aqueduct at Bullbridge, before turning towards Ripley. From there the Butterley Tunnel took it through to the Erewash Valley. From the tunnel it continued to Ironville, the junction for the branch to Pinxton, and then descended through fourteen locks to meet the Erewash Canal at Langley Mill. The Pinxton Branch became important as a route for Nottinghamshire coal, via the Erewash, to the River Trent and Leicester and was a terminus of the Mansfield and Pinxton Railway. A long section of the Cromford canal between Cromford and Ambergate is listed as a Biological Site of Special Scientific Interest (SSSI) and a Local Nature Reserve. In addition to purely canal traffic, there was a lively freight interchange with the Cromford and High Peak Railway, which traversed the plateau of the Peak District from Whaley Bridge in the north west, and which descended to the canal at High Peak Junction by means of an inclined plane. Origins At the end of the eighteenth century an extension was proposed to the Erewash Canal by various interested parties who wished to encourage coal mining further north. The suggestion was declined by the canal company, so local businessmen, including Joseph Outram, the father of Benjamin decided to go ahead on their own, asking William Jessop to design one between Langley Mill and Cromford, with a branch to Pinxton. This would carry coal to Cromford, which was becoming industrialised, and limestone from the area for the growing iron industry. Also important would be lead from Wirksworth and cotton from the Cromford mills. The connection to the Erewash Canal would provide an outlet to the Trent and Mersey Canal and the rest of the country. The canal therefore attracted the support of some powerful figures such as Philip Gell of Hopton Hall and Sir Richard Arkwright - the latter initially at least. Matters were taken out of the Erewash Canal owners hands,