Black Loch is a small loch

Loch

Loch is the Irish and Scottish Gaelic word for a lake or a sea inlet. It has been anglicised as lough, although this is pronounced the same way as loch. Some lochs could also be called a firth, fjord, estuary, strait or bay...

 or reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 on the border of North Lanarkshire

North Lanarkshire

North Lanarkshire is one of 32 council areas in Scotland. It borders onto the northeast of the City of Glasgow and contains much of Glasgow's suburbs and commuter towns and villages. It also borders Stirling, Falkirk, East Dunbartonshire, West Lothian and South Lanarkshire...

 and Falkirk

Falkirk

Falkirk is a town in the Central Lowlands of Scotland. It lies in the Forth Valley, almost midway between the two most populous cities of Scotland; north-west of Edinburgh and north-east of Glasgow....

district, close to the village of Limerigg.

The surface area of the Black Loch was enlarged in the early 1790s a small canal was cut at the western side so that run off from the moss would feed the loch and a dam built to enclose a larger volume of water which was required by the Monkland canal at Woodhall. Therefore this loch or reservoir to be more precise is not only the source of the north Calder but also an important source of the water supply for the Monkland canal and further downstream, the Forth & Clyde canal at Glasgow.