The Boyne flowing under the old bridge in Trim with a cherry blossom in bloom.
Earth has not anything to show more fair:
Dull would he be of soul who could pass by
A sight so touching in its majesty;
Composed upon Westminster Bridge, Sept. 3, 1802 by Willian Wordsworth.
Other bridge poems:
The Bridge by Hart Crane. First section here.
The Old Bridge at Florence by Henry Wadsworth Longfellow
The Bridge Poem by Donna Kate Rushin.