A fence crosses the fell just east of the summit and this runs along the Sleddale Fells from Selside Pike in the north to Grey Crag and its satellite, Harrop Pike in the south. This boundary provides an aid to route finding in poor conditions. Another man made feature near to the summit is the remains of a surveying pillar. This unusual stone and concrete construction is cleft at the top to provide a sight line and was originally surrounded by a wooden frame, now decayed. This is one of four such pillars built during the construction of the Haweswater aqueduct. Below Branstree and Tarn Crag is the first section of the pipeline carrying water from the reservoir toward Manchester. The tunnel, some 1,300 ft below the summit, required 250 tons of gelignite for blasting, and when constructed in the 1930s was the longest such pipeline in Britain. It emerges into Longsleddale below Great Howe, where the spoil can still be seen.