Drawing of Waste Weir at 67.15 miles, just above Lock 37 (Mountain Lock) on the Six Mile Level below Shepherdstown, below the Antietam Ck Aqueduct. HABS says: HABS MD,22-ANTI.V,7- (sheet 1 of 1) - Chesapeake & Ohio Canal, Waste Weir, Lock No. 37, 67.15 miles above tidewater, Antietam, Washington County, MD