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West Hills, Portland, Oregon
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. The highest peak in the range is Dixie Mountain at . Other notable peaks include Cornell Mountain at 1,270 feet (390m), Council Crest at , 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 Forest Park. The landscape, inside and outside the park, is predominantly forested. History The hills date from the late Cenozoic era, and range up to over . Composed mainly of basalt, the mountains were formed by several flows of the Grande Ronde b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multnomah County, Oregon
Multnomah County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the county's population was 815,428. Multnomah County is part of the Portland–Vancouver– Hillsboro, OR–WA Metropolitan Statistical Area. Though smallest in area, Multnomah County is the state's most populous county. Its county seat, Portland, is the state's largest city. History The area of the lower Willamette River has been inhabited for thousands of years, including by the Multnomah band of Chinookan peoples long before European contact, as evidenced by the nearby Cathlapotle village, just downstream. Multnomah County (the thirteenth in Oregon Territory) was created on December 22, 1854, formed out of two other Oregon counties – the eastern part of Washington County and the northern part of Clackamas County. Its creation was a result of a petition earlier that year by businessmen in Portland complaining of the inconvenient location of the Washington County seat in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grande Ronde Basalt
The Columbia River Basalt Group is the youngest, smallest and one of the best-preserved continental flood basalt province on Earth, covering over mainly eastern Oregon and Washington, western Idaho, and part of northern Nevada. The basalt group includes the Steens and Picture Gorge basalt formations. Introduction During the middle to late Miocene epoch, the Columbia River flood basalts engulfed about of the Pacific Northwest, forming a large igneous province with an estimated volume of . Eruptions were most vigorous 17–14 million years ago, when over 99 percent of the basalt was released. Less extensive eruptions continued 14–6 million years ago. Erosion resulting from the Missoula Floods has extensively exposed these lava flows, laying bare many layers of the basalt flows at Wallula Gap, the lower Palouse River, the Columbia River Gorge and throughout the Channeled Scablands. The Columbia River Basalt Group is thought to be a potential link to the Chil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Landforms Of Multnomah County, Oregon
A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays, peninsulas, and seas, including submerged features such as mid-ocean ridges, volcanoes, and the great ocean basins. Physical characteristics Landforms are categorized by characteristic physical attributes such as elevation, slope, orientation, stratification, rock exposure and soil type. Gross physical features or landforms include intuitive elements such as berms, mounds, hills, ridges, cliffs, valleys, rivers, peninsulas, volcanoes, and numerous other structural and size-scaled (e.g. ponds vs. lakes, hills vs. mountains) elements including various kinds of inland and oceanic waterbodies and sub-surface features. Mountains, hills, plateaux, and plains are t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountain Ranges Of Oregon
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least 300 metres (1,000 feet) above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges. Mountains are formed through tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southwest Hills, Portland, Oregon
Southwest Hills is a neighborhood in the West Hills (Tualatin Mountains) in the southwest section of Portland, Oregon, United States. The northeastern part of the neighborhood, above Goose Hollow and Downtown Portland, is known as Portland Heights. Much of the western portion of the neighborhood lies outside the Portland city limits, in unincorporated Multnomah County. Neighborhood landmarks include Council Crest Park Council Crest Park is a city park in southwest Portland in the U.S. state of Oregon. Amenities include paved and unpaved paths, a dog off-leash area, picnic tables, public art, a view point, and a wedding site that can be reserved. The park, o ... and Ainsworth Elementary School. Parks *Council Crest Park - SW Council Crest Dr. *Governors Park - SW 13th Ave & Davenport St. *Marquam Nature Park - SW Marquam St & Sam Jackson Park Rd. *Norris House & Property - 4455 SW Terwilliger Blvd. *Portland Heights Park - SW Patton Rd. & Old Orchard Rd. Coordinates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Oregon Mountain Ranges ...
There are at least 50 named mountain ranges in the U.S. state of Oregon. Many of these ranges extend into the neighboring states of California, Idaho, Nevada, and Washington. Elevations and coordinates are from the U.S. Geological Survey, Geographic Names Information System, unless otherwise indicated. See also * List of mountains of Oregon * Lists of Oregon-related topics * List of mountain ranges of California * List of mountain ranges of Nevada Notes {{Oregon, collapsed Oregon, List of mountain ranges of Mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited Summit (topography), summit area, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
KLTH
KLTH (106.7 Hertz, MHz "The Eagle") is a commercial radio, commercial FM broadcasting, FM radio station, city of license, licensed to Lake Oswego, Oregon, and serving the Portland metropolitan area. It is owned by iHeartMedia, Inc., and airs a classic hits radio format. Specialty programs on KLTH include Casey Kasem's "American Top 40, American Top 40: The 70s" on Saturday and Sunday mornings. Sundays also feature Yacht rock, Yacht Rock". KLTH's studios and offices are located on SW 68th Parkway in Tigard, Oregon. The transmitter is located on SW Barnes Road in the Tualatin Mountains. KLTH covers much of Northwestern Oregon and Southwestern Washington (U.S. state), Washington. History KQIV The station sign-on, signed on for the first time at 10:15 P.M. PDT on September 15, 1972 as KQIV. It was a short-lived but popular progressive rock station. KQIV was owned and operated by Willamette Broadcasting Company, Inc., with Walter J. M. Kraus serving as president. The station ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Robertson Tunnel
The Robertson Tunnel is a twin-bore light rail tunnel through the Tualatin Mountains west of Portland, Oregon, United States, used by the MAX Blue and Red Lines. The tunnel is long'' Light Rail and Modern Tramway'', November 1993, p. 302. UK: Ian Allan Publishing/ Light Rail Transit Association. and consists of twin tunnels. There is one station within the tunnel at Washington Park, which at deep is the deepest subway station in the United States and the fifth-deepest in the world. Trains are in the tunnel for about 5 minutes, which includes a stop at the Washington Park station. The tunnel has won several worldwide engineering and environmental awards. It was placed into service September 12, 1998. The tunnels pass through basalt layers up to 16 million years old. Due to variations in the rock composition, the tunnel curves mildly side to side and up and down to follow the best rock construction conditions. The tunnels vary from 80 to 300 feet (24–91 m) below the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MAX Light Rail
The Metropolitan Area Express (MAX) is a light rail system serving the Portland metropolitan area in the U.S. state of Oregon. Owned and operated by TriMet, it consists of five color-designated lines that altogether connect the six sections of Portland; the communities of Beaverton, Clackamas, Gresham, Hillsboro, Milwaukie, and Oak Grove; and Portland International Airport to Portland City Center. Service runs seven days a week with headways of between 30 minutes off-peak and three minutes during rush hours. In 2019, MAX had an average daily ridership of 120,900, or 38.8 million annually. Due to the COVID-19 pandemic, which impacted public transit use globally, annual ridership plummeted, with only 14.8 million riders recorded in 2021. MAX was among the first second-generation American light rail systems to be built, conceived from freeway revolts that took place in Portland in the early 1970s. Planning for the network's inaugural eastside segment, then re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MAX Blue Line
The MAX Blue Line is a light rail service in Portland, Oregon, United States, operated by TriMet as part of the MAX Light Rail system. It travels east–west for approximately —the longest in the network—between Hillsboro, Beaverton, Portland, and Gresham and serves 48 stations from to . The line carried an average 55,370 riders each day on weekdays in September 2018, the busiest of the five MAX lines. It runs for 22 hours per day from Monday to Thursday, with headways of between 30 minutes off-peak and five minutes during rush hour. Service runs later in the evening on Fridays and Saturdays and ends earlier on Sundays. The success of local freeway revolts in Portland in the early 1970s led to the reallocation of federal assistance funds from the proposed Mount Hood Freeway and Interstate 505 (I-505) projects to mass transit. Amid various proposals, local governments approved the construction of a light rail line between Gresham and Portland in 1978. Referred to as th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plank Road
A plank road is a road composed of wooden planks or puncheon logs. Plank roads were commonly found in the Canadian province of Ontario as well as the Northeast and Midwest of the United States in the first half of the 19th century. They were often built by turnpike companies. Origins The Wittmoor bog trackway is the name given to each of two historic plank roads or boardwalks, trackway No. I being discovered in 1898 and trackway No. II in 1904 in the ''Wittmoor'' bog in northern Hamburg, Germany. The trackways date to the 4th and 7th century AD, both linked the eastern and western shores of the formerly inaccessible, swampy bog. A part of the older trackway No. II dating to the period of the Roman Empire is on display at the permanent exhibition of the Archaeological Museum Hamburg in Harburg, Hamburg. This type of plank road is known to have been used as early as 4,000 BC with, for example, the Post Track found in the Somerset levels near Glastonbury, England. This type of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Willamette River
The Willamette River ( ) is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is long, lying entirely in northwestern Oregon in the United States. Flowing northward between the Oregon Coast Range and the Cascade Range, the river and its tributaries form the Willamette Valley, a basin that contains two-thirds of Oregon's population, including the state capital, Salem, and the state's largest city, Portland, which surrounds the Willamette's mouth at the Columbia. Originally created by plate tectonics about 35 million years ago and subsequently altered by volcanism and erosion, the river's drainage basin was significantly modified by the Missoula Floods at the end of the most recent ice age. Humans began living in the watershed over 10,000 years ago. There were once many tribal villages along the lower river and in the area around its mouth on the Columbia. Indigenous peoples lived throughout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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