Blackton Reservoir is a 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...

 in County Durham

County Durham

County Durham is a ceremonial county and unitary district in north east England. The county town is Durham. The largest settlement in the ceremonial county is the town of Darlington...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. It is situated in Baldersdale

Baldersdale

Baldersdale is a dale, or valley, on the east side of the Pennines in England, north of Barnard Castle. Its principal settlements are Hury and Briscoe. Baldersdale lies within the traditional boundaries of the North Riding of Yorkshire...

, about 4 miles (7 km) west of Cotherstone

Cotherstone

Cotherstone is a village and civil parish in the Pennine hills, in Teesdale, County Durham, England.Cotherstone lies within the historic county boundaries of the North Riding of Yorkshire, but along with the rest of the former Startforth Rural District it was transferred to County Durham for...

, where the River Balder

River Balder

The Balder is an English river that rises on the eastern slope of Stainmore Common in the Pennine Chain and flows eastwards for about 13 miles to the River Tees at Cotherstone.The River Balder is in County Durham...

 joins the River Tees

River Tees

The River Tees is in Northern England. It rises on the eastern slope of Cross Fell in the North Pennines, and flows eastwards for 85 miles to reach the North Sea between Hartlepool and Redcar.-Geography:...

.

It is owned by Northumbrian Water

Northumbrian Water

Northumbrian Water Group plc is the holding company for several companies in the water supply, sewerage and waste water industries. NWG's largest subsidiary is Northumbrian Water Limited , which is one of ten companies in England and Wales that are regulated water supply and sewerage utilities...

 and supplies water for Teesdale

Teesdale

Teesdale is a dale, or valley, of the east side of the Pennines in England. Large parts of Teesdale fall within the North Pennines Area of Outstanding Natural Beauty - the second largest AONB in England and Wales. The River Tees rises below Cross Fell, the highest hill in the Pennines, and its...

.

Blackton is one of a series of reservoirs on the same stretch of the Balder, located immediately downstream of the larger Balderhead Reservoir

Balderhead Reservoir

Balderhead Reservoir is a reservoir in Baldersdale, County Durham, England. It is one of a chain of three reservoirs on the River Balder, a tributary of the River Tees, which it joins at Cotherstone, about 5 miles to the east....

 and being almost continuous with Hury Reservoir

Hury Reservoir

Hury Reservoir is a reservoir in County Durham, England situated in a dale called Baldersdale. The reservoir is located about four miles south of Middleton-in-Teesdale and about three miles west of Cotherstone. It supplies water for Teesdale and is owned by Northumbrian Water. It gets its name...

further downstream.