Pakistani Prime Minister Yousuf Raza Gilani is set to visit a lake in the north, formed after a landslide and on the verge of breaking its banks.
Officials say thousands of villagers have left the area as waters are rising rapidly. Reports say many homes nearby have already been submerged.
Attabad lake formed when landslides blocked a river in January.
On Thursday army officials said they were continuing efforts to help with draining the swelling lake.
Lt Gen Shaid Niaz said that "spillways" were being dug around the lake as a temporary solution to help water drain from it.
Officials have warned that the danger of the lake overflowing and flooding the area would be highest during the rainy season in June.