The Thames Gateway Bridge was a proposed crossing over the River Thames in east London, England. It was first mooted in the 1970s but never came to fruition. The concept was re-proposed in 2004, with preliminary planning proceeding until November 2008, when Boris Johnson, the then Mayor of London, formally cancelled the entire £500 million scheme. In 2009, a new scaled-down project was launched involving a potentially new crossing between Tower Bridge and the Dartford Crossing.