Accomodating density portland oregon

The Willamette River, which flows north through downtown, serves as the natural boundary between east and west Portland.

The denser and earlier-developed west side extends into the lap of the West Hills, while the flatter east side fans out for roughly 180 blocks until it meets the suburb of Gresham.

In 1891 the cities of Portland, Albina, and East Portland were consolidated, creating inconsistent patterns of street names and addresses.

The "great renumbering" on September 2, 1931 standardized street naming patterns, divided Portland into five official quadrants, and changed house numbers from 20 per block to 100 per block.

Portland's access to the Pacific Ocean via the Willamette and Columbia rivers, as well as its easy access to the agricultural Tualatin Valley via the "Great Plank Road" (the route of current-day U. Route 26), provided the pioneer city with an advantage over other nearby ports, and it grew very quickly.

Portland 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.

At the turn of the 20th century, the city had a reputation as one of the most dangerous port cities in the world, a hub for organized crime and racketeering.

These massive floods occurred during the last ice age and filled the Willamette Valley with 300 to 400 feet (91 to 122 m) of water.

By the 1970s, Portland had well established itself as a progressive city, and experienced an economic boom for the majority of the decade; however, the slowing of the housing market in 1979 caused demand for the city and state timber industries to drop significantly. Helens, a highly active volcano 50 miles (80 km) northeast of the city in Washington state, is easily visible on clear days and is close enough to have dusted the city with volcanic ash after its eruption on May 18, 1980.

The city's increased presence within the cultural lexicon has established it as a popular city for young people, and it was second only to Louisville, Kentucky as one of the cities to attract and retain the highest number of college-educated people in the United States. According to a 2017 survey, several of these faults were characterized as "probably more of a hazard" than the Cascadia subduction zone due to their proximities to population centers, with the potential of producing magnitude 7 earthquakes.

To the west of the Tualatin Mountains lies the Oregon Coast Range, and to the east lies the actively volcanic Cascade Range. Johns Bridge, a Gothic revival suspension bridge built in 1931, to the north. Jackson Memorial Bridge and the Interstate Bridge provide access from Portland across the Columbia River into Washington state.

The Willamette River runs through the center of the city, while Mount Tabor (center) rises on the city's east side. Helens (left) and Mount Hood (right center) are visible from many places in the city.

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Beginning in the 1960s, Portland is frequently recognized as one of the world's most environmentally conscious cities because of its high walkability, large community of bicyclists, farm-to-table dining, expansive network of public transportation options, and over 10,000 acres (4,000 hectares) of public parks.

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