A further meeting to update Whaley Bridge residents on the current situation regarding Toddbrook Reservoir has been arranged.
The meeting is due to be held at 5pm on Sunday, August 4, at Chapel School, on Long Lane, Chapel-en-le-Frith.
A spokesperson for Derbyshire Constabulary said: "Representatives from the police, fire & rescue service, Office of the Police and Crime Commissioner and the Canal and River Trust will be in attendance.
"It is crucial that emergency services have contact details of all evacuated residents.
"If residents are not able to attend the meeting we would ask that they ring the helpline number on 01629 533190."
Earlier on Saturday, residents in Whaley Bridge were briefly allowed back into their homes to collect essential belongings, medical supplies and pets.
Chief Superintendent Michelle Shooter said: “I would like to take this opportunity to remind local residents that the state of the dam is still in a critical condition and that the risk of breach is still a very real threat.
“Residents wishing to return are reminded that this should be for essential belongings, medical supplies that cannot be got elsewhere and abandoned pets.
“Officers today have been confronted at cordons by residents wishing to return for issues which are deemed non-essential. Evacuation of people from their homes, was a decision which was not taken likely but has been done to offer maximum safety should we see a breach of the dam”.
Should the dam fail, or there be a fear that a collapse is imminent, the emergency service vehicles will sound their horns three times and a loud hailer will also sound.
Residents will be required to move out of the town via the check point where they entered and then make their way to higher ground.