Part of the route through Smithywood Business Park in Chapeltown has been covered with sand and stones, with drainage channels cut either side.
But regular users say it is only part of the section that needs tackling - and it all should be asphalt.
Cyclist and campaigner Dennis Patton said a ‘grotty slope’ remained, with a ‘swimming pool’ at the bottom.
And he contrasted it with the rest of the Blackburn Valley Cycleway, which is four miles long and links Meadowhall with Chapeltown.
He said: “I dont know if this surface finish will last. The recent rain has already caused erosion. If we get a lot of persistent rain, all of the good progress will just wash away.
“From Meadowhall to the bottom of the slope it is tarmac. It is supposed to be a ‘strategic green route’ for all. So it should meet the required standards."
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Edward William Fitzalan-Howard, is the 18th Duke of Norfolk, and lives in Arundel Castle in West Sussex. He is director of a company that co-owns Smithywood with St Paul’s Developments.
Estate agents Fowler Sandford is based in the Duke of Norfolk’s office on St James’ Street in Sheffield city centre.
Jeremy Robinson of Fowler Sandford said the path had been laid ‘to a recognised specification suitable for its intended use’.
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He added: “The use of a rolled/compacted natural material and a water-permeable surface is sympathetic to the immediate environment. It is not intended to lay a bitumen-coated roadstone surface.”
Planning obligations require ‘a new section of cycle lane with every new phase of the development’, according to Coun Douglas Johnson, executive member for climate change, environment and transport.
The state of the cycle path came to light in December when Mr Patton said it was ‘unridable’ due to mud, ruts and puddles.
At the time, Jeremy Robinson said it had been damaged by the builders of a warehouse on the business park and illegal off-road motorbikes and 4x4 vehicles and it had been ‘repaired and reinstated several times’.
He also pledged to have it repaired before the end of March this year.