side of the island is Castle Mill Stream, an old navigation channel that runs to the east closer to the centre of Oxford rejoining the Thames below the lock. On the eastern bank is the open ground of Port Meadow as far as Wolvercote. There are navigation transit markers alongside Port Meadow upstream of Medley Boat station, to allow river users to check their speed. A powered boat should not pass between the markers in under one minute. The Thames Path crosses to the Oxford side at Osney Bridge and then crosses Fiddler's Island and Medley Footbridge returning to the western bank to continue to Godstow Lock. See also Locks on the River Thames Sources External links Osney Lock at Geograph References 1790 establishments in England Locks on the River Thames Locks of Oxfordshire Transport in Oxford