The Environment Agency (EA) has said divers will be sent out today to try to remove a blockage at Cornard weir that has caused the water levels on the River Stour in Sudbury to drop by around six feet.
Some areas, such as the cut off by the Quay Theatre, have almost totally dried out, while previously submerged banks and bridge footings have been exposed.
The EA has been out rescuing thousands of fish that were in danger, left in small puddles.
An EA spokeswoman said: “At the moment we are getting the divers out today to get the blockage removed.
“We couldn’t get them out before unfortunately.”
It was originally hoped the blockage, which is causing a control gate to remain jammed open at the weir, would be removed over the weekend.
Sudbury Drone Photography has been out recording some remarkable footage of the low levels which can be viewed by clicking play on the video screen in the article.