High Bullough Reservoir Wikipedia
High Bullough Reservoir is the oldest of all the reservoirs in the Rivington chain. Popular with walkers, it forms part of the Anglezarke trail, although it is also accessible from Manor House. Originally named as Chorley 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, 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.