23' - expect major flooding, especially near Kalama Washington. This river level historically nears the tops of several levees along the Columbia and Lewis Rivers.<br><br>21' - expect major flooding near St. Helens Oregon and Kalama Washington, along with widespread flooding of lowland agricultural areas.<br><br>19' - expect widespread lowland flooding. Levee watches have historically been in effect at this and higher stages for Bachelor Island and locations near Lewis River confluence.<br><br>17' - expect flooding of low lying farmland to begin. Levee watches along the Lewis River historically have been in effect at this level.<br><br>15.5' - expect flooding of low areas along the Columbia.<br><br>