flows as far as Teddington Lock: the weir at Richmond Lock is only used at low tide, to maintain the water level above it. Chalmore Lock (1838) was removed in 1883. See also Thames Barrier Crossings of the River Thames Islands in the River Thames Tributaries of the River Thames References External links A user's guide to the River Thames (published by the Environment Agency) More information about Thames locks, bridges and canals. River Thames