The foundations at the little parking area at the east end of the road... The map below is from Don and Roberta Lowe's 1969 book 100 Oregon Hiking Trails. They write about this in conjunction with the old Wyeth Trail trailhead, "Turn left at the junction and park at the trail head about 100 feet to the east of the rock shop. A sign marks the start of the Wyeth Trail, No. 411."
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Old Foundations Were Once a Rock ShopFrom Don and Roberta Lowe's 1969 book 100 Oregon Hiking TrailsThe foundations were buried or removed by landscaping for the new State Trail Fragment... I've heard, though I do not remember from where, that there was a rock shop at this location. More research is needed.