19.5' - expect major and widespread flooding in the upper Tualatin Valley, with numerou road closures likely and several homes flooded or isolated due to surrounding flood waters.<br><br>18.5' - a few homes are threatened by floodwaters. Numerous roads are flooded and may be closed, and widespread lowland agricultural flooding occurs.<br><br>17.5' - several minor roads begin to flood and may be closed. Widespread lowland agricultural flooding occurs at this and higher stages.<br><br>17' - expect inundation of low areas, including some farmland, along the river channel.<br><br>