There was some introduced Bachelor Button and Foxglove in the vicinity, so wondering if this is an introduced ornamental or a wildflower ?
There are a lot of native Silenes in Oregon but they can be difficult to identify without the actual plant or very detailed photos. Here's a link to silenes found in Oregon: http://plants.usda.gov/java/stateSearch?searchTxt=silene&searchType=Sciname&stateSelect=US41&searchOrder=1&imageField.x=53&imageField.y=11
Thanks for the bump, purple!
Katlian, thanks for the link. I just finished looking through the Silene image gallery there, looking for a match. Most of the silenes there have fringed or lobed petals, and none are reddish with white edging . . . s'pose it could still be a variety of one of the plainer ones with entire petals. I also looked at the Dianthus image gallery there . . . no matches.