Here are two good links to keep an eye on Northwest Oregon hydrology:
http://www.nwd-wc.usace.army.mil/nwp/teacup/willamette/
That one shows diagrams and all sorts of numbers relating to Army Corps of Engineer reservoir operations. I noticed just about all of them are mostly full tonight.
http://water.weather.gov/ahps2/index.php?wfo=pqr
The 2nd is the Northwest River Forecast Center here in Portland. You can click on your closest river and see what it might do in the next few days. Quite a rise forecast on most rivers, but AS OF NOW none are forecast to rise to flood stage.
Mark