The Mountain Mile begins at the nearby Guthrie's Bridge at the 27th Milestone and incorporates the former East Snaefell sheep-gate, East (Snaefell) Mountain Gate and the Mountain Box. The A18 Snaefell mountain road was developed in the mid-nineteenth century from a number of pre-existing roads and bridle paths.[1] This included the building of a number of sheep-gates including the East Mountain Gate, the Beinn-y-Phott sheep-gate and Keppel Gate. The primary A18 Mountain Road section from Park Lewellyn (North Barrule) to Keppel Gate is a product of the Disaforesting Commission of 1860.[2] This section of the A18 Mountain Road was purpose built, reflecting typical nineteenth century highway and railway construction practices with many small scale cuttings, embankments and revetments which follows land contours with purpose built graded-sections. For the 1934 Isle of Man TT races major alterations to the Mountain Course occurred, including the removal of the East Snaefell Mountain sheep-gate.[3]
