Hanham Lock is situated on the River Avon

River Avon, Bristol

The River Avon is an English river in the south west of the country. To distinguish it from a number of other River Avons in Britain, this river is often also known as the Lower Avon or Bristol Avon...

, at the village of Hanham

Hanham

Hanham is a village on the eastern outskirts of Bristol, England, situated on the A431 between Bristol, Bath and Keynsham. It is in the unitary authority of South Gloucestershire. It became a civil parish on April 1, 2003....

 near Bristol

Bristol

Bristol is a city, unitary authority area and ceremonial county in South West England, with an estimated population of 433,100 for the unitary authority in 2009, and a surrounding Larger Urban Zone with an estimated 1,070,000 residents in 2007...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.

Hanham Lock is the first lock east of Netham where boats leave the Bristol Floating Harbour. A weir

Weir

A weir is a small overflow dam used to alter the flow characteristics of a river or stream. In most cases weirs take the form of a barrier across the river that causes water to pool behind the structure , but allows water to flow over the top...

 carries the river and boats use the adjacent lock. It is numbered as 1 and is officially the first on the Kennet and Avon Canal

Kennet and Avon Canal

The Kennet and Avon Canal is a waterway in southern England with an overall length of , made up of two lengths of navigable river linked by a canal. The name is commonly used to refer to the entire length of the navigation rather than solely to the central canal section...

. It opened in 1727 and there used to be a colliery wharf just west of the lock, however the mines closed in the 19th century.

The river below Hanham Lock is considered to be tidal, as high tides often pass over the weir at Netham.