Flash lock
![Sketch of a flash lock on the River Thames between Whitchurch-on-Thames and Pangbourne around 1786, showing method of winching a barge up over a weir. Flash locks were common on the Thames above Staines.](/Images/godic/202501/13/Flash_Lock_Thames_17860437.jpg")
![Capstan Wheel near Hurley, England that was used to winch boats upstream past a flash lock. It is said to be the only one left in England and was restored in 1999.](/Images/godic/202501/13/Flash_Lock_Capstan_Wheel0437.JPG")
![Paddle and Rymer weir on the Thames](/Images/godic/202501/13/Paddle_and_rymer_weir0437.jpg")
![Paddles stored for use at Northmoor lock](/Images/godic/202501/13/Paddles_used_for_the_Paddle_and_rymer_weir_at_Northmoor_lock_on_the_River_Thames0437.jpg")
Early locks were designed with a single gate, known as a flash lock or staunch lock. The earliest European references to what were clearly flash locks were in Roman times.
Flash lock
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