 The section of the state highway in Towson was built in the 1910s and the portion through Jacksonville to Jarrettsville was constructed in the late 1920s and early 1930s.The gap in MD 146 through Loch Raven Reservoir was filled in two steps of maintenance swaps in the early 1960s and late 1970s.MD 146 begins at the Towson Roundabout, a five-leg, racetrack-shaped roundabout in the center of Towson.