Question: What football club relocated to the stadium at Marshgate Lane in the Lower Lea Valley in 2016?

Context paragraphs:
Lea Valley lines: The Lea Valley lines are two commuter lines and two branches in North East London, so named because they run along the Lower Lea Valley of the River Lea.  They were part of the Great Eastern Railway, now part of the "Anglia Route" of Network Rail.

Carpenter's Road Lock: Carpenter's Road Lock is a rising radial lock in the London Borough of Newham, near Marshgate Lane in Stratford, England.  It is located on the Bow Back Rivers and was constructed in 1933/34.  It is the only lock in Britain with rising radial gates at both ends.  British Waterways were hoping to restore it as part of the upgrade to Bow Back Rivers which took place for the London 2012 Games, but the gantries which enabled the gates to be raised were demolished to accommodate a wide bridge giving access to the main stadium.  After the games, most of the overbridge was removed.  Funding for the restoration of the lock was in place by early 2016, and it is expected to be brought back into use in 2017.

Water City: Water City is a community interest company (also knows Water City CIC) created by Andrew Mawson.  It operates in the area in and around the Queen Elizabeth Olympic Park in East London and the Lower Lea Valley.

London Riverside: The London Riverside is a redevelopment area on the north side of the River Thames in East London, England and part of the larger Thames Gateway redevelopment zone.  The London Riverside area forms part of the Green Enterprise District, a project to create a low-carbon economy region in Greater London.  Land available for redevelopment is owned by GLA Land and Property.  From 2004 to 2013 the redevelopment of London Riverside and the Lower Lea Valley was the responsibility of the London Thames Gateway Development Corporation.  There is also a London Riverside business improvement district which covers a smaller area.

London Stadium: London Stadium (originally known as the Olympic Stadium) is a stadium in Stratford, London, England, at Marshgate Lane in the Lower Lea Valley.  It was constructed to serve as the home stadium for the 2012 Summer Olympics and Paralympics, hosting the track and field events and opening and closing ceremonies.  It was subsequently renovated as a multi-purpose stadium, with its primary tenants being West Ham United Football Club and British Athletics.  The stadium is 6+1/2 mi from Central London.

Lower Lea Valley: The Lower Lea Valley is the southern end of the Lea Valley which surrounds the River Lea.  It is part of the Thames Gateway redevelopment area and was the location of the 2012 Summer Olympics.

What Have You Done Today Mervyn Day?: What Have You Done Today Mervyn Day?  is a fan club only release by Saint Etienne featuring 18 original and unreleased pieces of music that featured in their film of the same name about the redevelopment of the Lower Lea Valley in London.  It was performed live by the band at the film's premiere at the Barbican.

Lea Valley Saints: Former Australian rules football club in the Lower Lea Valley region of London, England.

Lea Valley: The Lea Valley, the valley of the River Lea, has been used as a transport corridor, a source of sand and gravel, an industrial area, a water supply for London, and a recreational area.  The London 2012 Summer Olympics were based in Stratford, in the Lower Lea Valley.

West Ham United F.C.: West Ham United Football Club is a professional football club based in Stratford, East London, England.  They compete in the Premier League, the top tier of English football.  The club re-located to the London Stadium in 2016.

Supporting paragraphs: West Ham United F.C. London Stadium
Answer: West Ham United Football Club