the tunnel is located at the junction of chapel street with bobbinmill hill and front street (), near to riverside cottage, in the village of fritchley. it runs under chapel street in a broadly north–south direction for , with a height of . the tunnel is constructed from blocks of sandstone. a bend and joint in the stonework is located from the northern end, which is believed to mark the end of the original (northern) section, dating from 1793. at the point where the two sections join, part of the north-east wall has been repaired or strengthened using brick. the roof is arched, with a circular cross section, and is supported on vertical sides. the tunnel walls have gaps, believed to represent holes left by timbers used in building the arch. the north and south entrances have a semi-circular arch; the voussoirs are each constructed from one course of stone blocks. the northern entrance has a stone wall above it that forms a parapet beside chapel street. both ends of the tunnel have been blocked; the northern end with soil, and the southern end with a modern red-brick structure on top of an older stone structure.