Many agencies are involved in the work to tackle the floodwater in Malton.
Nine emergency pumps are being used to pump the water safely back into the Derwent.
It rose to a record high of 5.05m – but the flood defences held.
Agencies have been working through the night to protect residents and properties.
Cllr Keane Duncan, leader of Ryedale District Council, said: “The river looks to have peaked at 5.05m earlier this morning.
“This is a new record high, but we can’t compare 2000 with 2021 as we now have the defences to protect the towns.
“The situation is under control at the moment with no major property flooding.
“We have a tried and tested plan, and we are putting that into place.
“Teams from the councils, fire and rescue and Environment Agency remain on the ground. Well done to all of them.
“Extra pumps have been drafted in overnight and this morning.
“There is more water in and around St Nicholas Street too and it is very icy under foot. County Bridge is not accessible to pedestrians, with Norton Road difficult to traverse due to pumps.
“Please stay safe out there if you do need to venture out.”