Mount Sylvania
Encyclopedia
Mount Sylvania is an extinct volcano
, part of the Boring Lava Field
, on the outskirts of Portland, Oregon
. The parts of the mountain are within the cities of Portland, Lake Oswego
, and Tigard
. Mountain Park, a Lake Oswego suburb
an development, was built on the mountain in the 1970s.
The Sylvania campus of Portland Community College
is located on the mountain's western slopes.
Volcano
2. Bedrock3. Conduit 4. Base5. Sill6. Dike7. Layers of ash emitted by the volcano8. Flank| 9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15...
, part of the Boring Lava Field
Boring Lava Field
The Boring Lava Field is an extinct Plio-Pleistocene volcanic field zone with at least 32 cinder cones and small shield volcanoes lying within a radius of 13 miles of Kelly Butte, which is approximately 4 miles east of downtown Portland, Oregon, in the United States...
, on the outskirts of Portland, Oregon
Portland, Oregon
Portland is a city located in the Pacific Northwest, near the confluence of the Willamette and Columbia rivers in the U.S. state of Oregon. As of the 2010 Census, it had a population of 583,776, making it the 29th most populous city in the United States...
. The parts of the mountain are within the cities of Portland, Lake Oswego
Lake Oswego, Oregon
Lake Oswego is a city located primarily in Clackamas County in the U.S. state of Oregon. Small portions of the city are also located in neighboring Multnomah and Washington counties. Located south of Portland surrounding the Oswego Lake, the town was founded in 1847 and incorporated as Oswego in...
, and Tigard
Tigard, Oregon
Tigard is a city in Washington County, Oregon, United States. The population was 48,035 at the 2010 census. As of 2007, Tigard was the state's 12th largest city. Incorporated in 1961, the city is located south of Beaverton and north of Tualatin, and is part of the Portland metropolitan area...
. Mountain Park, a Lake Oswego suburb
Suburb
The word suburb mostly refers to a residential area, either existing as part of a city or as a separate residential community within commuting distance of a city . Some suburbs have a degree of administrative autonomy, and most have lower population density than inner city neighborhoods...
an development, was built on the mountain in the 1970s.
The Sylvania campus of Portland Community College
Portland Community College
Portland Community College is Oregon's largest community college, located in Portland, United States. It serves over one million residents in the five county area of Multnomah, Washington, Yamhill, Clackamas, and Columbia...
is located on the mountain's western slopes.