National Guard troops have resumed truck convoys to ferry stranded Lyons residents through the floodwater to shelter.
Lt. Skye Robinson says the convoys began again Saturday morning after spending most of Friday transporting residents from the town.
An estimated 2,500 residents are being evacuated.
Robinson says helicopter airlifts of 295 residents from Jamestown continued into the night and also were expected to resume on Saturday.
Evacuations are voluntary, but the outlook for those who choose to stay with their homes and property is weeks without power, water, sewer or cellphone service.