SK5837 : The approach to Wilford Suspension bridge
taken 2 years ago, near to West Bridgford, Nottinghamshire, England
This was built in 1908 by Nottingham Corporation Water Department in the first instance to carry a water pipeline across the River Trent to Wilford Hill Reservoir, but the opportunity was taken to incorporate a pedestrian facility as well. The bridge still belongs to the water authority (in 2010 Severn Trent Water), and use by pedestrians and cyclists is still only permissive; it is not a right of way. It is Listed Grade II.
The following link shows the bridge during its period of closure and repair between 2008 and 2010, a project which cost £1.9m. Link
Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom, covered by around 375,000 listings.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites, and in more recent times a road crossing (Abbey Road) and graffiti art (Banksy 'Spy-booth') have been included.
In England and Wales there are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.
There are also locally listed structures (at the discretion of local authorities) using A, B and C designations.
In Scotland three classifications are also used but the criteria are different. There are around 47,500 Listed buildings.
Category A (8%)- generally equivalent to Grade I and II* in England and Wales
Category B (51%)- this appears generally to cover the ground of Grade II, recognising national importance.
Category C (41%)- buildings of local importance, probably with some overlap with English Grade II.
In Northern Ireland the criteria are similar to Scotland, but the classifications are:
Grade A (2.3%)
Grade B+ (4.7%)
Grade B (93%)
Read more at Wikipedia Link