If you are looking for a dry place to put your livestock, there are many resources available right now around the Willamette Valley.
Benton County Fairgrounds has stalls open, just call 541-207-6911 before you go.
Linn County Fairgrounds has stalls open.
Oregon State Fairgrounds in Salem has opened the old racing stalls. The gates at Silverton/Lana RD intersection will be open all night to accommodate those evacuating. Please call 503-947-3247 before you go. They will supply power and water, but you need to bring your own bedding and feed.
You can also check for private barns and pastures open by local horse owners. Many have offered their personal property. Check Willamette Valley Horse Owners.