Description - 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 a 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 Willamette Valley vineyards.
Vital Stats: There is no fee to use this park.
Recreation - Opportunities for recreation at this site include hiking, viewing interpretive signs, and viewing scenery.
Climate - Climate in this region changes with elevation. The area receives a high amount of precipitation. Much of the precipitation comes from October to April in the form of rain at the low elevations and as wet heavy snow in the higher elevations. Winter temperatures are normally cool at the lower elevations and cold at the higher elevations. Although snow is possible in the lowest elevations, it is infrequent and does not stay on the ground for long. Late spring, summer and early autumn bring the best chance for clear, sunny days and bring moderate temperatures.
Erratic Rock is located in the Willamette Valley, six miles east of Sheridan off Oregon Highway 18.