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Portland (/ ˈ p ɔːr t l ə n d / PORT-lənd) is a port city in the Pacific Northwest and the most populous city in the U.S. state of Oregon.Situated in the northwestern area of the state at the confluence of the Willamette and Columbia rivers, it is the county seat of Multnomah County, Oregon's most populous county.
Köppen climate types of Oregon, using 1991-2020 climate normals. Trewartha climate types of Oregon. According to the Köppen climate classification, most of Western Oregon has a warm-summer Mediterranean climate (or Csb type), which features warm, dry summers, and wet winters with frequent overcast and cloudy skies.
Willamette River. Willamette Valley basin. The Willamette Valley ( / wɪˈlæmɪt / ⓘ wil-AM-it) is a 150-mile (240 km) long valley in Oregon, in the Pacific Northwest region of the United States. The Willamette River flows the entire length of the valley and is surrounded by mountains on three sides: the Cascade Range to the east, the Oregon ...
An aerial view of the Willamette River's flood. The Willamette Valley flood of 1996 was part of a larger series of floods in the Pacific Northwest of the United States which took place between late January and mid-February 1996. It was Oregon 's largest flood event in terms of fatalities and monetary damage during the 1990s.
The climate is usually marine-influenced, but easterly winds from the Columbia River Gorge periodically bring continental temperature extremes. The region covers 305 square miles (790 km 2) in Washington and 269 square miles (697 km 2) in Oregon, including the northern and eastern suburbs of the Portland metropolitan area.
Date. 20 days. December 18, 1964. ( 1964-12-18) – January 7, 1965. ( 1965-01-07) Location. California, Oregon, and Washington states. The Christmas flood of 1964 was a major flood in the United States' Pacific Northwest and some of Northern California between December 18, 1964, and January 7, 1965, spanning the Christmas holiday.
The Oregon Coast Range, often called simply the Coast Range and sometimes the Pacific Coast Range, is a mountain range, in the Pacific Coast Ranges physiographic region, in the U.S. state of Oregon along the Pacific Ocean. This north-south running range extends over 200 miles (320 km) from the Columbia River in the north on the border of Oregon ...
The Pacific temperate rain forests are characterized by a high amount of rainfall, in some areas more than 300 cm (10 ft) per year and moderate temperatures in both the summer and winter months (10–24 °C or 50–75 °F). This ecoregion is a subregion of the Cascadia bioregion . These rainforests occur in a number of ecoregions, which vary in ...