The start of the walk, The Green at Collingham
Cromwell Weir by the side of the lock is one of the largest (and most dangerous) weirs on the Trent and marks the tidal limit of the river.
The wall of North Collingham Church, facing Carlton Ferry Lane, has marker stones let into its structure recording heights and dates of various notable flood events. These go back as far as February 1795 when one such flood was so severe that the river gave up its course for a while and flowed through a low piece of ground, between Newark and Stapleford, into the River Witham and retook its old route (pre ice age) to the sea at Boston on the Wash. Later floods have been less severe due to the building of flood defences.
Even more interesting than the birds is the history of the Trent Valley gravel pits.
And at the end of the walk, even more interesting bird life.
