Teddington Lock at Staines, to the West and upstream from London.
There are 75 over the non tidal Thames and 29 cross the tidal Thames
The river Thames is tidal as far upstream as Teddington Lock which is in a suburb of West London.
The tidal section is from the sea to about 90 kms upstream to Teddington
75 non tidal and 29 over the tidal part of the Thames
The River Thames becomes tidal at Teddington Lock, which is located about 14 miles upstream from central London. This is where the controlled flow of the river starts to be influenced by the tides of the North Sea.
The tidal flow is 3-4 knots.
68 miles, as far as Teddington
There are 130 -200 bridges over the Thames. Possibly the most famous is the Tower Bridge near the centre of London.
The tidal part of the Thames starts at Teddington in Middlesex, UK. There are 29 bridges that cross over the tidal part of the Thames.
Among others, United Kingdom (Thames River) and Italy (Venetian Lagoon)
That would be the River Thames.
None. There is a tidal barrier, east of London for flood prevention and several weirs, but no dams.