ROF Thorp Arch
Coordinates: 53°54′58″N 1°19′08″W / 53.916°N 1.319°W
ROF Thorp Arch was one of sixteen Second World War, UK government-owned Royal Ordnance Factory, which produced munitions by "filling" them. It was a medium-sized filling factory (Filling Factory No. 9).
It was located on the banks of the River Wharfe, north east of the two villages of Boston Spa and Thorp Arch; and four miles south east of the town of Wetherby, West Yorkshire in England.
The Royal Ordnance Factory was constructed for the Ministry of Supply, with the Ministry of Works acting as agents. The site was connected to the London & North Eastern Railway line, which was used in its construction and then for supplying raw materials to the factory and for transporting away filled munitions.
Construction work on Thorp Arch began on 18 May 1940 and the completion date was scheduled for the end of July 1941. The site was divided into a number of separate Filling Groups which occupied different areas of the site and were devoted to filling specific type of ammunition. It produced munitions for both the Army and the Royal Air Force. It is believed to have had 619 buildings.
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