This 40-ton rock was deposited during a prehistoric flood. Other than this specimen, rocks of this type are only found in Canada. It was carried here on an iceberg during an Ice Age some 20,000 years ago, probably by way of the Columbia River. The rock was deposited when the ice melted. This is the largest glacial erratic found in the Willamette Valley. The trail to the rock provides an excellent view of Yamhill Valley Vineyards. Park along Oldsville Road off of Highway 18 to reach this park. From Oldsville Road, you'll need to walk up a short paved path to the rock itself. The trail becomes steep briefly as you near the rock.

Nice short hike. No parking lot, so we parked close to the road. The hike is pretty much uphill, but there are some nice views from the top.

Great short hike close see to home with the kiddos . Great for picnic lunch at the top with great views .

Beautiful view. Geologically interesting.

quick simple trail with the kids, great view at the top!

Short walk and very close to a noisy road. It has nice views once at the top.

Great views. Nice walk!

There is enough parking for about six cars across the street from the trail head. I went on a week day so plenty of parking. There is about an 80 foot difference in elevation from the trail marker and the rock. So if you don't climb stairs this one is going to give you a burn on your calves. It's a nice walk more or less.

Beautiful little stroll in Oregon wine country. The entire 0.25 miles up to the rock is paved. Also, There is a little parking area that can hold roughly 4 cars.

Note: Some pranksters moved the picnic table on top of the rock, and it was too heavy for us to take off.