The West Vale structure would once again give outstanding views to those who cross it.
Calderdale Council in partnership with Sustrans, a charity that creates traffic-free routes, wants to convert the redundant railway route for approximately 500 metres from Rochdale Road to Queen Street.
It would then form part of the chain in the Route 66 National Cycle Network being developed by Sustrans. The charity has taken over responsibility for the viaduct from The British Rail Residuary Board and the structure has been assessed as one of the best structually in the UK by Sustrans founder John Grimshaw.
The viaduct deck is overgrown with grass and vegetation and closed to the public.
A bitumin surface will be laid to provide all-year walking and cycling, as well as sealing the deck against water penetration.
Safety railings will be installed but designed so the panoramic views are not spoiled.
The work will cost £125,000, with the council paying £25,000 and Sustrans the remainder.
Council project engineer Richard Binks said: "There are stunning views and the route goes through a woodland cutting.
"Assuming we get planning permission, we will start work in late January and open late May." The Grade Two listed viaduct was built in 1874 for the Lancashire and Yorkshire Railway and has been redundant for decades.
A 300-metre woodland cutting leads to the viaduct and a housing development at the eastern end fronting Queen Street has included a path which will access the viaduct.
Calderdale Council planning department is being asked to agree the change of use and listed building consent.