Perhaps Oregon Fawn Lily or White Fawn Lily? This plant has mottled leaves at or near the base of the flower stem while trilliums--which admittedly look a lot like this plant--have unmottled leaves higher up the stem. I'm not very familiar with flowers from the Northwest, however. Take a look at http://calphotos.berkeley.edu/cgi/img_query?enlarge=0000+0000+0403+0742
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