Portland is a city located in the Northwestern United States, near the confluence of the Willamette and Columbia rivers in the state of Oregon. As of July 2008, it has an estimated population of 575,930, making it the thirtieth most populous in the United States, and has been referred to as the greenest city in the United States. Portland is Oregon's most populous city, and the third most populous city in the Pacific Northwest, after Vancouver, British Columbia, and Seattle, Washington. Approximately two million people live in the Portland metropolitan area (MSA), the 23rd most populous in the United States as of July 2006.

Portland was incorporated in 1851 and is the county seat of Multnomah County. The city extends slightly into Washington County to the west and Clackamas County to the south. It is governed by a commission-based government headed by a mayor and four other commissioners.

The city and region are noted for strong land-use planning and investment in light rail, supported by Metro, a distinctive regional-government scheme. Portland is also known for its large number of microbreweries and microdistilleries, and as the home of the Trail Blazers NBA basketball team.

Portland lies in the Marine west coast climate region, marked by warm, dry summers and rainy but temperate winters. This climate is ideal for growing roses, and for more than a century, Portland has been known as "The City of Roses" with many rose gardens—most prominently the International Rose Test Garden.

History

Portland started as a spot known as "the clearing," which was on the banks of the Willamette about halfway between Oregon City and Fort Vancouver. In 1843, William Overton saw great commercial potential for this land but lacked the funds required to file a land claim. He struck a bargain with his partner Asa Lovejoy of Boston, Massachusetts: for 25¢, Overton would share his claim to the 640 acre (2.6 km²) site. Overton later sold his half of the claim to Francis W. Pettygrove of Portland, Maine. Pettygrove and Lovejoy each wished to name the new city after his respective home town; this was decided with a coin toss, which Pettygrove won in a series of two out of three tosses. The coin used for this decision, now known as the Portland Penny, is on display in the headquarters of the Oregon Historical Society.

At the time of its incorporation on February 8, 1851 Portland had over 800 inhabitants, a steam sawmill, a log cabin hotel, and a newspaper, the Weekly Oregonian. By 1879, the population had grown to 17,500. The city merged with Albina and East Portland in 1891 and with Linnton and St. Johns in 1915.

Portland's location, with access both to the Pacific Ocean via the Willamette and the Columbia rivers and to the agricultural Tualatin Valley via the "Great Plank Road" through a canyon in the West Hills (the route of current-day U.S. Route 26), gave it an advantage over nearby ports, and it grew quickly. It remained the major port in the Pacific Northwest for much of the 19th century, until the 1890s, when Seattle's deepwater harbor was connected to the rest of the mainland by rail, affording an inland route without the treacherous navigation of the Columbia River.

Portland straddles the Willamette River near its confluence with the Columbia River. The denser and earlier-developed west side is mostly hemmed in by the nearby West Hills (Tualatin Mountains), though it extends over them to the border with Washington County. The flatter east side fans out for about 180 blocks, until it meets the suburb of Gresham. Rural Multnomah County lies farther east.

In 1891 the cities of Portland, Albina, and East Portland were consolidated, and duplicate street names were given new names. The "great renumbering" on September 2, 1931 standardized street naming patterns, and changed house numbers from 20 per block to 100 per block. It divided Portland into five sections: Southwest, Southeast, Northwest, North, and Northeast. Burnside St. divides north and south, and the Willamette River divides east and west. The river curves west five blocks north of Burnside and in place of it, Williams Ave. is used as a divider. The North section lies between Williams Ave. and the Willamette River to the west.

On the west side, the RiverPlace, John's Landing and South Waterfront Districts lie in a "sixth quadrant" where addresses go higher from west to east toward the river. This "sixth quadrant" is roughly bounded by Naito Parkway and Barbur Boulevard to the west, Montgomery Street to the north and Nevada Street to the south. East-West addresses in this area are denoted with a leading zero.

Parks and gardens

Portland is proud of its parks and its legacy of preserving open spaces. Parks and greenspace planning date back to John Charles Olmsted's 1903 Report to the Portland Park Board. In 1995, voters in the Portland metropolitan region passed a regional bond measure to acquire valuable natural areas for fish, wildlife, and people. Ten years later, more than 8,100 acres (33 km2) of ecologically valuable natural areas had been purchased and permanently protected from development.

Portland is one of only three cities in the contiguous U.S. with extinct volcanoes within its boundaries (besides Jackson, Mississippi and Bend, Oregon). Mount Tabor Park is known for its scenic views and historic reservoirs.

Forest Park is among the largest wilderness parks within city limits in the United States, covering more than 5,000 acres (20 km²). Portland is also home to Mill Ends Park, the world's smallest park (a two-foot-diameter circle, the park's area is only about 0.3 square m). Washington Park is just west of downtown, and is home to the Oregon Zoo, the Portland Japanese Garden, and the International Rose Test Garden. Nearby is Council Crest Park, the highest point in Portland.

Tom McCall Waterfront Park runs along the west bank of the Willamette for the length of downtown. The 37-acre (15 ha) park was built in 1974 after Harbor Drive was removed and now hosts large events throughout the year. Portland's downtown features two groups of contiguous city blocks dedicated for park space; they are referred to as the North and South Park Blocks.

Tryon Creek State Natural Area is one of three Oregon State Parks in Portland and the most popular; its creek has a run of steelhead. The other two State Parks are Willamette Stone State Heritage Site located in the West Hills and the Government Island State Recreation Area located in the Columbia River near Portland International Airport.

The Beverly Cleary Sculpture Garden, which immortalizes three of the award-winning author's best known characters with bronze sculptures, quote plaques, and a fountain, is located in Grant Park, just a few blocks from the real Klickitat Street of "Henry Huggins" fame.

Leach Botanical Garden is a 15.6-acre (6 ha) botanical garden in the Southeast section of the city, featuring indigenous plants of the Pacific Northwest.

Crystal Springs Rhododendron Garden is a 9.49-acre (4 ha) garden in the southeastern city adjoining Reed College, featuring more than 2,500 rhododendron, azalea, and companion plants.