Cross Keys Bridge is a swing bridge that carries the busy single carriageway A17 road which runs from Newark in Nottinghamshire to King’s Lynn in Norfolk over the tidal River Nene in Sutton Bridge in the extreme south east of Lincolnshire close to the borders of both Norfolk and Cambridgeshire.
It is the only crossing point for both traffic and pedestrians over the river north of the Cambridgeshire town of Wisbech some nine miles to the south of the bridge.
When it was built in 1897, it was the third bridge to cross the Nene in Sutton Bridge.
Wikipedia https://en.wikipedia.org/wiki/Crosskeys_Bridge
Coordinates 52°45'59.543" N 0°11'43.626" E