Sandford Lock is a lock on the River Thames in England, situated at Sandford-on-Thames which is just south of Oxford. The first pound lock was built in 1631 by the Oxford-Burcot Commission although this has since been rebuilt. The lock has the deepest fall of all locks on the Thames at 8 ft 9in (2.69m) and is connected to a large island which is one of three at this point. The lock lies at the end of Church Lane in Sandford on Thames. Upstream from the lock, the main weir connects the second island to the opposite bank on the Kennington, Oxfordshire side. This is the location of the infamous Sandford Lasher, a treacherous weirpool where many have drowned. Another weir links the two lower islands. History There was a mill here built by the Knights Templar in around 1294. There are also records of a ferry and a fish weir in medieval times. In the reign of Edward III there is an account of the immemorial conflict between millers and bargemen when "the men of Oxon broke down the locks of Sandford". This was probably at the navigation weir or flash lock on the old river channel behind the second island. This was described in 1624 as ‘Great Lockes’. It was replaced in 1631 when the Oxford-Burcot Commission built one of the first pound locks in England here. The lock was passed on to the Thames Navigation Commission in 1790 and lengthened in 1795, under the direction of Daniel Harris, the Oxford gaoler, at a cost of nearly £1,800. In 1836 a new lock was built on the current site alongside the old one and a lock house was ordered in 1839. The old lock has since been filled in after an incident when a miller opened the sluices and caused damage to the embankments. Its position is still visible (the position of the upper gates can be seen in the stonework above the present upper gates). An iron bridge above the lock was built between 1866 and 1877. The latest rebuild of the lock was in 1972. Sandford Lasher Sandford Lasher, or weir, is on the left bank well upstream of Sandford Lock. The pool below the weir has been notorious since the 19th century because of the number of individuals who have drowned there. Weirs, like the one at Sandford Lasher, generate powerful currents that can trap