Editing Richmond Lock and Footbridge (section)

{{Short description|Lock and pedestrian bridges in London, England}}
{{Use dmy dates|date=September 2017}}
{{Use British English|date=September 2017}}
{{Infobox waterlock
|lock_name   = Richmond Lock
|image= Richmond Lock from Isleworth,Middx looking SE.jpg
|caption= Richmond Lock and Footbridge, viewed from near [[Isleworth]], [[London]]
|waterway = [[River Thames]]
|county = [[Greater London]]
|maint   = [[Port of London Authority]]
|first    = 1894
|latest   =
|length = {{convert|250|ft|m|1|lk=on}} 
|width = {{convert|26|ft|8|in|m|1}}
|fall = Half tide lock ({{convert|10|ft|m|0}})
|sealevel = {{convert|2|ft}} (maximal low tide below lock) to greater than {{convert|20|ft}} (usual maximal high tide above lock)
| pushpin_map = United Kingdom London Richmond upon Thames
|enda =
|distenda =
|endb =
|distendb =
| map_cue=
| map_image=
| map_text=
| map_width=
| coordinates= {{Coord|51|27|44|N|0|19|02|W|region:GB_type:landmark|display=inline,title}}
{{infobox designation list
| embed=yes
| designation1 = Grade II*
| designation1_offname =Richmond Footbridge, Lock and Sluices
| designation1_date = 25 May 1983
| designation1_number = 1250044
}}
}}
{{Richmond Lock map}}
'''Richmond Lock and Footbridge''' is a [[Lock (water navigation)|lock]], rising and falling [[tidal barrage|low-tide barrage]] integrating controlled sluices and pair of [[pedestrian]] [[bridge]]s on the [[River Thames]] in southwest [[London]], England, and is a Grade II* [[listed building|listed structure]].<ref name=listing>{{National Heritage List for England|num=1250044 |desc= Richmond Footbridge, Lock and Sluices|date=25 May 1983|access-date=27 November 2008}}</ref> It is the furthest downstream of the forty-five Thames locks and the only one owned and operated by the [[Port of London Authority]]. It was opened in 1894 and is north-west of the centre of [[Richmond, London|Richmond]] in a semi-urban part of southwest London. Downstream are [[Syon Park]] and [[Kew Gardens]] on opposite banks. It connects the promenade at Richmond with the neighbouring district of [[St Margarets, London|St. Margarets]] on the west bank during the day and is closed at night to pedestrians – after 19:30 [[GMT]] or after 21:30 when [[British Summer Time|BST]] is in use. At high tide the sluice gates are raised and partly hidden behind metal arches forming twin footbridges.

It was built to maintain the lowest-lying head of water of the [[Locks and weirs on the River Thames|forty-five navigable reaches of the Thames]] above the rest of the [[Tideway]]. Below the structure for a few miles, at low tide, the navigable channel is narrow and restricts access for vessels with the greatest [[draft (hull)|draft]]. The next major point of mooring below the lock is, accordingly, at [[Brentford Dock]].