Tualatin Mountains

Tualatin Mountains
West slope of the mountains from Beaverton looking north
Highest point
PeakDixie Mountain
Elevation1,609 ft (490 m)
Coordinates45°31′35″N 122°45′11″W / 45.52639°N 122.75306°W / 45.52639; -122.75306
Geography
Tualatin Mountains is located in Oregon
Tualatin Mountains
Tualatin Mountains
location of Tualatin Mountains in Oregon[1]
CountryUnited States
StateOregon
DistrictMultnomah County
Range coordinates45°34′50″N 122°47′45″W / 45.58056°N 122.79583°W / 45.58056; -122.79583
Topo mapUSGS Linnton
Geology
Mountain typeLava flows
Volcanic fieldBoring Lava Field, Columbia River Basalt Group
Last eruption7 million years ago

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.

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.

  1. ^ a b c "Tualatin Mountains". Geographic Names Information System. United States Geological Survey, United States Department of the Interior.
  2. ^ "Tualatin Mountain Range". Tualatin Life. Retrieved June 20, 2011.
  3. ^ "Council Crest Park". Portland Parks & Recreation: City of Portland. 2008. Retrieved June 20, 2011.