Revealed: TfL spent more on failed Garden Bridge than maintaining Thames’ crossings in last decade 1/5 Source: Shutterstock/Will Barton More money was wasted developing plans for the failed Garden Bridge project than Transport for London (TfL) has spent on maintaining 25 River Thames crossings during the last 10 years, it can be revealed. In total, TfL has spent just under £43 million on maintaining Thames crossings since 2010 – some £10million less than the £53 million spent developing plans for the Garden Bridge under Boris Johnson’s mayorship. According to the AJ's sister title New Civil Engineer (NCE), this total maintenance spend only accounts for capital expenditure by TfL and does not include any additional maintenance funding from local councils.