the primary water source for the Forth and Clyde Canal, and so some sections are still in water today, notably the eastern section between Woodhall and eastern Coatbridge, and between the west of that town and Cuilhill. The rest of the waterway to Port Dundas was converted into a culvert to maintain the water flow, and much of it now lies beneath the M8 motorway which was constructed along its path in the early 1970s; the motorway was originally called "the Monkland Motorway". The culvert remains under the jurisdiction of Scottish Canals (as successor to British Waterways) because of its function as a feeder to the Forth and Clyde Canal. The Scottish Development Agency was formed in 1975, and the canal was the subject of the Monkland Canal Land Renewal Project. The line of the non-motorway section was protected by the District Council from 1978, and there has been some progress with creating a linear park and walkway along its route. The route forms an important part of the Summerlee Heritage Park and Drumpellier Country Park. Water supply Throughout its existence, procuring a reliable water supply was a significant issue for the canal. During the first construction phase under James Watt, Airdrie South Burn was used as a source, and "some sort of lade was carried up the burn for ". When the Drumpellier section of the canal was completed, the section to the east around Muttonhole (at the west end of Coatbridge) was not ready and a temporary reservoir was created with a turf dam at "the Flatters", near Drumpellier Moss. In the early 1830s, the embankments were raised (to increase the holding capacity) at Hillend reservoir (near Caldercruix) and at the Black Loch (near Limerigg). About 1836 an entirely new reservoir was built at Lily Loch adjoining Hillend. Between 1846 and 1849 a new reservoir was made at Roughrigg, (south-east of Airdrie), jointly with the Airdrie and Coatbridge Water Company. The Canal was entitled to draw annually, and the capacity of Hillend, Lily Loch and Black Loch together was about . Nonetheless in the dry season of 1849 this proved insufficient and the canal was closed for several weeks; this led to the installation of the Blackhill incline. The canal's interest in the Roughrigg reservoir was bought out by the Water Company in 1874 for £18,000. Passengers Cleland says that in 1813, three passage-boats operated: one was between