Drawing of Lock 35, an 1830 design lock. Note how gates are BELOW the breast wall, and there are no conduits in the masonry (as opposed to the 1828 design locks). HABS says: HABS MD,22-HARF.V,9- (sheet 1 of 2) - Chesapeake & Ohio Canal, Lock 35, 62.3 miles above tidewater, Sharpsburg, Washington County, MD