You can access this trail at the halfway point on the East Ridge Trail #1324 or about 3.3 miles up North Ridge Trail #1350 (conversely about 0.6 miles down from the summit parking area). This less-crowded singletrack trail undulates along the northeastern face of Marys Peak.
You'll encounter two small creeks which should be easy to cross with dry feet. It descends as it rounds the NE ridge before ascending to North Ridge Trail #1350. You'll have some glimpses of the Willamette Valley through the trees. It is most useful for extending either the North or East Ridge Trail runs by adding on a lollipop loop extension.