The C & O Canal, then owned by the Baltimore & Ohio Railroad, formally ceased operations in March 1924. After severe flooding in 1936, B & O Railroad sold the canal to the National Park Service in October 1938. The waterfront area retained its industrial character in the first half of the 20th century. Georgetown was home to a lumber yard, a cement works, the Washington Flour mill, and a meat rendering plant, with incinerator smokestacks and a power generating plant for the old Capital Traction streetcar system, located at the foot of Wisconsin Avenue, which closed in 1935, and was demolished in October 1968. In 1949, the city constructed the Whitehurst Freeway, an elevated highway above K Street, to allow motorists entering the District over the Key Bridge to bypass Georgetown entirely on their way downtown.