Update 5pm: A 70ft tree has fallen across the A387 in Looe by the police station, blocking the road in both directions.
Officials have warned that heavy rain sweeping through the Duchy over the rest of the weekend could cause further misery to already badly afflicted areas.
Cornwall Council said the latest forecast from the Met Office and the Environment Agency suggest that further heavy rain will affect Cornwall between 6pm and 11pm today, with the possibility of between 20 – 30mm of rain falling generally, and larger amounts on high ground.
There is then further rain expected on Sunday into Monday.
Duty director Sandra Rothwell said: "As the ground is already totally saturated, there are concerns over further flooding in vulnerable areas. Flood warnings remain in place for rivers across Cornwall."
She said the River Fowey in Lostwithiel is still causing concern, with the latest reports suggesting 20 properties have been evacuated, with most people relocating to stay families and friends.
Additional rainfall could result in further evacuations of properties. Crews from the fire and rescue service, police, Environment Agency and Cormac remain on the scene.
The rest centre at the community centre in Lostwithiel is still open for anyone who has had to leave their homes. The Council said currently only one person is at the rest centre and it is expected they will shortly leave to stay with family.
Agencies are issuing warnings asking members of the public in Lostwithiel who are going to view the floodwater at the river and quay sides to stay away from these areas.
The level of the Rover Cober in Helston is also causing concern – there is still a severe flood warning in place and there are continuing problems with Loe Pool where the EA is carrying out pumping.
The fire and rescue service have two pumps and the high volume pump in place and have asked for an additional high volume pump which is on route from Avon.
Specialist water rescue crews are going door to door to offer assistance if required. The rest centre at Epworth Hall has been reopened to provide support for anyone who has had to leave their homes.
Residents of around 200 properties have been unable to access or leave their homes after two landslips this morning on Hannafore Road in Looe. A structural engineer is now on site to assess the stability of the road with the hope it can be partially reopened.
Cornwall Council said 16 Cormac crews are currently working across the county to deal with flooding incidents – these include clearing drains, gullies and culverts, clearing fallen trees and dealing with landslips. Crews are also supporting the incidents at Lostwithiel and Helston.
The fire and rescue service now has 16 appliances working across Cornwall, with all specialist water rescue appliances and crews fully deployed.
There are concerns about the stability of a building in Mevagissey, the bridge at Gwithian has been closed and the River at Porthleven is reported to be threatening to burst its banks.
The emergency centre at County Hall is expected to remain open this evening and overnight.
