19' - expect major widespread flooding of lowland areas, along with flooding of some areas in and near Longview. Water levels have historically neared the tops of several levees at this stage.
18' - expect major and widespread flooding of lowland areas along the Columbia from Kalama downstream to Clatskanie, including flooding of some areas in and near Longview. Water levels have historically neared the tops of some levees at this stage.
17' - expect flooding of most islands on the Columbia River near Longview and Rainier, along with extensive flooding of unleveed farmland, mainly on the Washington side of the river.
15' - expect widespread flooding of unleveed farmland along the Columbia and low-lying areas in the vicinity of Longview, Kalama, and Woodland.
14' - expect flooding of farmland and property not protected by levees to begin in and near Longview, Kalama, and Woodland.
13.5' - expect minor flooding of farmland and low-lying areas not protected by levees along the Columbia.