28.5' - major flooding in Kelso occurs, including residential and business areas. Numerous roads are flooded and closed, and levees may be subject to erosion and overtopping at this level.

26.5' - some flooding of business and residential areas occurs in Kelso. Numerous road closures can be expected. The top of some levees are approached at this level.

24.5' - flooding of a few residential areas in Kelso begins. Also expect widespread flooding of pasture land and low lying roads.

21.5' - flooding of several low lying and secondary roads begins, including the Cowlitz Gardens neighborhood, along with flooding of pasture and lowland upstream of Kelso.

19.5' - the river is at bankfull level.