Tualatin Mountains
The Tualatin Mountains (also known as the West Hills or Southwest Hills of Portland) are a range on the western border of Multnomah County, Oregon, United States. A spur of the Northern Oregon Coast Range, they separate the Tualatin Basin of Washington County, Oregon, from the Portland Basin of western Multnomah County and Clark County, Washington.
| Tualatin Mountains | |
|---|---|
West slope of the mountains from Beaverton looking north | |
| Highest point | |
| Peak | Dixie Mountain |
| Elevation | 1,609 ft (490 m) |
| Coordinates | 45°31′35″N 122°45′11″W |
| Geography | |
location of Tualatin Mountains in Oregon | |
| Country | United States |
| State | Oregon |
| District | Multnomah County |
| Range coordinates | 45°34′50″N 122°47′45″W |
| Topo map | USGS Linnton |
| Geology | |
| Mountain type | Lava flows |
| Volcanic field | Boring Lava Field, Columbia River Basalt Group |
| Last eruption | 7 million years ago |
The highest peak in the range is Dixie Mountain at 1,609 feet (490 m). Other notable peaks include Cornell Mountain at 1,270 feet (390m), Council Crest at 1,073 feet (327 m), and Pittock Hill, location of the Pittock Mansion.
Despite steep slopes, periodic landslides, and multiple earthquake faults, many residences have been built in the Tualatin Mountains, though much of the northern portion is undeveloped land within the 5,000-acre (20 km2) Forest Park. The landscape, inside and outside the park, is predominantly forested.