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The River Witham is a 82 mile long river, almost entirely in Lincolnshire. It rises south of Grantham close to South Witham, passes Lincoln and Boston, finally flowing into The Haven, a tidal arm of The Wash. The river is navigable from Lincoln to Boston.
Wikipedia: Link

This bridge over the River Witham is named by the Ordnance Survey as "Brace Bridge". I am not sure if this is a backformation from the adjacent settlement of Bracebridge. But the origin of that name is given as Old English braesc + brycg, meaning 'bridge or causeway made of branches'. So, perhaps, there has always been a bridge of that name somewhere round here.

The bridge carries the Lincoln to Newark traffic, historically the A46 road (that name is now carried on the bypass round Lincoln).