Two Plank Bridge and its connecting footpath are no longer set to close on Saturday 17 July.
Cllr Richard Davies, executive member for highways, said: "After meeting with the local MP and petitioners from the area, we've taken the decision to not close Two Plank Bridge until the summer holidays have started – so towards the end of July or in August.
"This is good news for children and parents since it means bridge and path will remain open for the final week of the school term, making it easier to get back and forth.
"This will also allow the project team extra time to finalise land agreements for the scheme's north section, which we expect to have signed and completed very soon.
"Once we have a confirmed date for when the closure at Two Plank will start, we'll share it straight away to ensure everyone that uses this route has as much time as possible to prepare."
The closure of Two Plank Bridge and the connecting footpath is still expected to last up to eighteen months from when it is shut.
For more information about the Spalding Western Relief Road project, visit www.lincolnshire.gov.uk/swrr.