What is the minimum footpath widths UK?
If the width of a path or way is not proven or is not defined in the definitive statement, the following minimum widths, as set out in the Highways Act, could be used: Cross field footpath, 1m. Field edge footpath, 1.5m.
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iMO this is a 1.5m wide field-edge footpath which does NOT allow access to the river other than to anglers who have paid a fee to the local club. This, IMO, is the legal status unless otherwise written down or agreed by land owner.
It is very interesting to note that the CROW act specifically refers to non tidal rivers. This part of the River is impounded by a Weir. IMO that Weir was constructed there by the owner of the Old House in order to claim the river as part of their property.
tidal rivers have a different ownership status.