Sheffield is being stripped of more than 1,000 trees in just over one year.
Figures obtained by The Star under the Freedom of Information Act reveal the council is working to fell 1,200 trees from a stock of 36,000 by March.
Streets Ahead contractor Amey has already pulled down 750 highway trees – some 100 years old – which they claim are dead, dying, diseased, dangerous or damaging structures since August 2012.
Surveys will be carried out every year as part of Streets Ahead.
A Sheffield Council spokesman said: “There are in the region of 1,200 trees that have been identified as dead, dangerous, diseased or damaging structures and those trees are spread across the city.
“At the end of this planting season, which ends in March, approximately 1,000 trees will have been replanted.
“Each tree that is removed will be replaced, however it may not be replaced in exactly the same position or even as soon as the tree has been removed.
“Tree planting season runs from November to March, therefore if a tree is removed in July there will be a short gap in replanting the new tree.”
Amey has agreed to replace every tree pulled down but there are no guarantees they will be planted in the same place.
The council was unable to promise the number of trees in the city would be retained in any future work.
Residents are told two to four weeks before work.
Sheffield Hallam MP Nick Clegg said: “Sheffield has a very green reputation and there are some very beautiful mature trees which line its roads, so it’s quite right residents feel anxious.
“Everybody understands that when you’re resurfacing roads across the city some trees will have to be pulled down, but it’s important that where that happens there is the maximum degree of public consultation possible and a full explanation.
“People need to have confidence nothing will spoil the character of our green city.”