At Crowland the Welland used to split into two channels, one broadly following the present course of the river, and the other joining the Old South Eau to reach the River Nene near Wisbech.

[2] The river no longer flows through Crowland, but the triangular bridge, which spanned the junction, remains in the centre of the town.

The earliest known mention of the bridge is by King Æthelbald of Mercia in 716.

In 1952 a watercolour of Trinity Bridge by F. W. Baldwin was used on a menu for the P&O liner RMS Strathmore.

A copy can be found in the Victoria and Albert Museum under reference number E.346-2005.