 It continued in use until 1969, to enable grain barges to use the lock, and although grain traffic stopped in that year, it recommenced in 1981, when the gate was again used.The gate is still used at the lock-keeper's discretion for boats which have a draught exceeding .The weirs which are the remnants of flash locks can still be seen on the River Thames though they are not used any more for navigation as regular pound locks were introduced in the eighteenth and nineteenth centuries and the last flash lock removed in 1937.