High Bullough reservoir is the oldest of all the 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...

s in the Rivington

Rivington

Rivington is a small village and civil parish of the Borough of Chorley, Lancashire, England, occupying . It is about southeast of Chorley and about northwest of Bolton. Rivington is situated on the fringe of the West Pennine Moors, at the foot of Rivington Pike...

 chain. Popular with walkers, it forms part of the Anglezarke

Anglezarke

Anglezarke is a sparsely populated civil parish in the Borough of Chorley in Lancashire, England. It is dominated by reservoirs that were built to supply water to Liverpool, and a large expanse of moorland with evidence of Bronze Age settlements...

 trail, although it is also accessible from Manor House. Originally named as Chorley

Chorley

Chorley is a market town in Lancashire, in North West England. It is the largest settlement in the Borough of Chorley. The town's wealth came principally from the cotton industry...

 reservoir, it has since been disconnected from the rest of the system and today functions as a nature reserve. It no longer produces drinking water for the public.

A huge staircase, made from timber

Timber

Timber may refer to:* Timber, a term common in the United Kingdom and Australia for wood materials * Timber, Oregon, an unincorporated community in the U.S...

, was created between the reservoir and nearby Manor House. Known as Jacob's Ladder, the remains can be seen on the east side of the water.