 MD 140 crosses the Monocacy River to enter Frederick County.The highway crosses Cattail Branch and Middle Creek and enters the town of Emmitsburg just east of the highway's extended interchange with US 15 (Catoctin Mountain Highway).East of the U.S. Highway, MD 140 has a four-way intersection with Harney Road and Emmit Gardens Drive, which is unsigned MD 904H (Emmit Gardens Drive) and leads to a right-in/right-out interchange with northbound US 15.