The Baytown Tunnel or Baytown – La Porte Tunnel was a two-lane underwater motor-vehicle tunnel connecting Baytown and La Porte, two suburbs of Houston, Texas. Completed in 1953, it traveled northeast-southwest underneath the Houston Ship Channel and had a length of 4,110 feet (1,250 m). It was closed to vehicular traffic in 1995 with the opening of the Fred Hartman Bridge, and subsequently demolished beginning in 1997 in order for the U.S.