The road bridge crosses the River Thames in London and connects the London boroughs of Tower Hamlets and Southwark. Tower Bridge is a neo-Gothic bascule bridge with the Tower of London and St. Catharine docks on the northern banks and City Hall on the southern landfall. The bridge is the property of Bridge House Estates a charity of the City of London Corporation. The bridge carries the A100 Tower Bridge Road. The two bascules can be raised to an angle of 86 degrees to allow large vessels to pass. The pedestrian walkways are fixed which means that the River Thames can be crossed by foot even with the bascules raised. Tower Bridge was opened in 1894. Five construction companies and 432 workers were involved in its construction. Two massive piers with a weight of 70,000 tons had to be embedded in the river to support the structure. More than 11,000 tons of steel were needed for the towers and the pedestrian bridges.