There is a 23-ft (7-m) difference between low and high tide at London Bridge . The Thames is navigable by barges is navigable for 306 km (191 miles)from Lech lade . The non - tidal part of the Thames from the source to Teddington stretches for 237 km (147 miles) and falls some 104.2 metres(342 feet) .

Flow

The speed of the Thames increases the further downstream you go(towards the sea) . This is because of more and more tributaries join the river adding their water to it .

*Buscot 799 million litres /day (176 million gallons / day)

*Reading 3594 million litres/day (790 million gallons/ day)

*Kingston 5696 million litres / day (1253 million gallons / day)