Adam Smith: A relatively busy road crosses a very busy part of the Thames at Newbridge. Two pubs sit on each side of the river.
The Thames Path is on the south side of the river to the west of the bridge and then moves over to the north on the east.
The best access is from the south side although you can get in a few hundred meters further up on the north side.
The river Windrush also runs into the Thames at this point, and while usually an inoffensive dribble most of the year, when the water is high or there has been heavy rain this small river can turn quite fierce in its own sweet way. A recommended swim when the water is high and fast is to walk along the windrush a few hundred metres north until it reaches the road and get in and let it take you and squirt you into the Thames proper out and under the bridge.
Otherwise there is plenty of opportunity to walk up and down the Thames Path here and get in at any spot and swim downstream to the Pub or swim on from the Pub and walk back. In the summer this popular spot can get rather crowded with small electric boats that are for hire so watch your back for drunken sailors!