Mount Hood is a dormant stratovolcano in northern Oregon, in the Pacific Northwest region of the United States. and is located about 60 miles (100 km) east of the city of Portland. Its snow-covered peak rises on the border between Clackamas and Hood River counties. It is the highest mountain in Oregon and the fourth-highest in the Cascade Range. It can be seen easily from both Portland and Vancouver, Washington. The eroded volcano has had at least four major eruptive periods during the past 15,000 years. The last three occurred within the past 1,800 years from vents high on the SW flank and produced deposits that were distributed primarily to the south and west along the Sandy and Zigzag rivers. The last eruptive period took place around 170 to 220 years ago, when dacitic lava domes, pyroclastic flows and mudflows were produced without major explosive eruptions. The photo was taken in late September of 2005 of its west facing slope.