The Gianella Bridge was a swing bridge that brought CA 32 across the Sacramento River at Hamilton City California between Glenn County and Butte County. It was built in 1937 by Cotton Brothers & Co. Contractors. Also known as Sacramento River Bridge at Hamilton City it was listed on the National Register of Historic Places in 1982. The bridge was documented by the Historic American Engineering Record (HAER) in 1984. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Building