A towpath along a historic aqueduct will close while Derbyshire County Council carries out essential repairs.
Work on the aqueduct which carries the Cromford Canal over the Derby to Matlock railway line will start on July 11 and will finish in November.
The existing towpath will be removed and replaced with a new steel path and the route over the railway will be closed during this time.
Signs will be in place to direct walkers and cyclists over the railway using an alternative route.
The 163-year-old aqueduct is a scheduled monument and is thought to be the only surviving example of a suspension girder bridge left in the country. Repairs are needed to address the corrosion and concerns about its long term stability.
The aqueduct’s status as a scheduled monument means the county council has a duty to maintain it and all repairs must be approved by English Heritage.
Cllr Simon Spencer said: “We have to start work as soon as possible because of the essential nature of the repairs. But I’m confident that the diversions will continue to allow visitors to enjoy the canal during the summer.”