Building work on a new bridge, reconnecting stranded residents with the wider community, will not begin until at least April 2026.
Old Bassaleg Bridge, in Newport, was shut suddenly shut in August 2021 due to significant structural damage, leaving residents concerned for their safety after emergency vehicles struggled to access the area.
Newport council said the £1m it received from a Welsh government fund was less than "the full amount it needed to progress with the construction phase of the project".
It had since abandoned plans to repair the existing bridge, and instead proposed a replacement structure, which previous estimates suggested could cost £9 million.
Given the new delay to construction beginning, it could be at least 2028 before Forge Mews becomes fully accessible once again.