Tualatin Mountains
Mountain range in Oregon, United States / From Wikipedia, the free encyclopedia
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.[1] 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 | |
---|---|
Highest point | |
Peak | Dixie Mountain |
Elevation | 1,609 ft (490 m) |
Coordinates | 45°31′35″N 122°45′11″W |
Geography | |
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).[2][1] 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.[3]
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.