DES MOINES, Iowa (AP) – Gov. Terry Branstad says all Iowa counties along the Missouri River will be affected by rising water and residents need to get ready because the worst of the flooding is still upriver.

Branstad at a news conference in Sioux City on Thursday says the state is ready to help, including the possibility of calling out the Iowa National Guard. He says there is a concern about Sioux City’s water treatment plant, which the near the river. But Branstad says he’s confident it will be OK.

Des Moines lost its water treatment plant in the 1993 flood, cutting off water for 12 days.

Branstad has issued emergency disaster proclamations for six counties – Fremont, Harrison, Mills, Monona, Pottawattamie and Woodbury. It allows state resources to be used for flood efforts.