forge flourished until the 1770s. A writer called Pococke described how "the pigs [of iron] were brought from Derbyshire to be melted into bars for use" in 1751. The fifth duke removed all traces of the forge. Beyond Carburton Forge Dam, another weir drops the level to Carburton Dam. A "water corn mill, walke mill or fulling mill" was mentioned in a lease agreement in 1678. The five Welbeck lakes cover an area of . Again there are two channels below the lake, with the main southern channel at a lower level than the northern one, which is called the Flood Dyke. Both cross under the B6034 Worksop to Ollerton road, and leave the Welbeck estate. The land between the two channels is sandy, and the Flood Dyke was used to irrigate the area, forming water meadows. Restoration of the historic structures was undertaken by the County Council in 2010/11, and interpretation boards have been erected to enable visitors to understand the process. Following an archaeological survey, restoration work was carried out on the main sluice in the Flood Dyke, and on a number of stone sluices, wooden hatches and cast iron valves, the latter dating from the 19th century. Clumber Lake Both channels pass under the road which serves the hamlet of Carburton, where the upper channel, Flood Dyke, ends in a field from where it enters a sluice and flows through a culvert into an open section. Water enters a second sluice and culvert and rejoins the lower channel. The upper sluice is marked "sluices" on the 1898 map, and fed a large fish pond to the east of the channel. The fish pond was disused by 1919, when it was marked as swampy ground. The lower channel flowed past the "Wheel House (pumping station)" in 1898. It continues under Carburton bridge to supply Clumber Lake, part of the Clumber estate of the Dukes of Newcastle, which has been owned by the National Trust since 1945. The Clumber estate was described in the 18th century as "A black heath full of rabbits, having a narrow river running through it, with a small boggy close or two." In 1772, the second Duke of Newcastle started construction of Clumber Lake, to complement his new house. A dam was built at the bottom end of the estate, the river bed was excavated to create a wide expanse of water, and an