The ESB has confirmed it is to release more water from Parteen Weir.
In a statement, the company said they'll be increasing the levels released throughout the morning by up to 8%.
The extra water could increase levels downstream of Parteen by up to three inches, prompting fears of more flooding at Clonlara, Westbury and Shannon Banks.
It comes as the Taoiseach Brian Cowen visits the midlands to witness the effects of the flooding there first hand.
Mr Cowen is set to meet with locals and officials in Westmeath and Offaly.