THE closure of the A39 Truro to Falmouth Road caused traffic chaos on Sunday and Monday evenings and Tuesday morning.
Fire crews had to pump water from the streets of Perranporth and a man from Chacewater witnessed the destruction of his dead father's prized possession.
Truro saw gushing rivers while in Ladock water damaged homes, but residents had the consolation of a free Sunday lunch in the local pub.
Peter Tatlow, a highways engineer from Cornwall Council, said the A39 had to be closed on Sunday and Monday because of flooding and remained closed on Tuesday morning for fear of a landslide.
He said: "A leat alongside the main road was full and the water was pouring out of it. We felt there was a danger that the whole lot might collapse."
The road re-opened at about 12.30pm on Tuesday after a morning of tailbacks and long delays in the Perranwell and Ponsanooth area as drivers tried to find ways around the road closure.
Mr Tatlow said the fire brigade pumped the water out and would be able to deal with the incident more quickly if it repeated.
In Ladock the intense rainfall on Saturday night meant the river flooded the main road through the village.
David Smith, landlord at the Falmouth Arms pub in Ladock, said: "The roads in the centre of the village began to flood. The drains just could not cope."
Mr Smith said residents were out in the streets before and during the floods attempting to clear the drains in vain.
The pub escaped serious flooding but the water got into 12 to 15 properties opposite. Mr Smith offered a free lunch to residents affected by the floods.
In Chacewater, Andrew Louth could not stop the rising water levels around the garage at his mother's house in Buckingham Nip after a culvert became blocked.
Cornwall Council highways staff and firefighters tried to clear the blockage to no avail and the water rose to thigh level.
Mr Louth said: "What I'm upset about is that a Triumph Stag that belonged to my dad, Victor Louth, who died six years ago, was in the garage. With tools and all my things we are talking about £20,000 worth of stuff."
Fire crews spent about six hours pumping water from the bottom of Station Road in the heart of Perranporth on Saturday night in order to prevent water flooding nearby properties.
A number of houses were flooded in The Coombe and Bolingey but damage was kept to a minimum thanks to the resort's £2 million flood alleviation scheme.
The A39 at Perranarworthal was due to be closed tonight and tomorrow night for roadworks.