Overflow to Lower Lake, three weirs to east side of dam and pump house adjacent to middle weir, in Bretton Park

The overflow to Lower Lake, three weirs on the east side of the dam, and a pump house adjacent to the middle weir are located in Bretton Park. The overflow and weirs likely date from around 1782, coinciding with the creation of Lower Lake, while the pump house probably dates from the early 19th century. The overflow and weirs are constructed from coursed squared stone with slight tooling or vermiculation. The pump house is made of coursed square rubble with quoins and features a stone slate roof.

The top weir marks the eastern end of The Cut, which flows eastward to the north of the lakes. The overflow travels through a tunnel-vaulted skew-bridge to connect with the second weir in a 90-degree curve. The third weir is shallower. All three weirs are stepped and concave, with the upper two weirs each having a drop of approximately 5 meters.

Inside the pump house, there is a brick wall that forms a wheel housing containing an iron-spoked water wheel with a diameter of about 2 meters (6 feet). Another chamber houses a crankshaft with two connecting rods leading to a pump. The goit that drives the wheel appears to have been blocked. The pump is reported to have been used to lift drinking water from a lower level to the main house, which is approximately 700 meters away.