Police have advised around 500 households in the St Asaph area to leave their homes as heavy rain swells the River Elwy, which has partly burst its banks.
An evacuation centre's been set up at Glan Clwyd School
This morning six flood warnings are in force in Wales.
There are also 24 flood alerts across the North and Mid Wales. There's been flooding overnight in Llanfair PG and there's travel disruption on the roads.