(WFXR) — Starting Tuesday, Appalachian Power says community members downstream of the Claytor Dam or the Leesville Dam could see a rapid rise in the water levels on the New and Roanoke rivers.

With the National Weather Service calling for high temperatures this week, PJM — the independent regional transmission organization that manages the electric grid in 13 states — has notified Appalachian Power it may need to increase power generation at its hydroelectric plants in order to maintain the reliability of the regional electric grid, officials say.

According to the company, water levels below Claytor Dam could rise by up to two feet in a matter of minutes. Meanwhile, water levels below Leesville Dam could increase as much as eight feet over a seven-hour period.

The company encourages anyone planning on boating, kayaking, tubing, or participating in any other recreational activity on the New River or the Roanoke River to monitor AEP’s website, as well as check the Smith Mountain or Claytor Facebook pages for updates.