Alameda Ridge

Alameda Ridge

The Alameda Ridge is a large gravel bar located in Portland, Oregon, United States.

Geologic History

Alameda Ridge was formed between 15,000 and 13,000 years ago at the end of the last ice age when the ice dam containing Glacial Lake Missoula collapsed some 40 times, causing some of the largest floods known on earth. The flood waters spilled across Idaho and eastern Washington, surged down the Columbia River and through the Gorge, flooding the Willamette Valley as far south as Eugene, Oregon. These floods covered the city of Portland, Oregon in approximately Convert|400|ft|m|1| of water, carving out Sullivan's Gulch, the large ravine that holds Interstate 84, and depositing a large volumes of unconsolidated silt, sand, gravel, and boulders. [ [http://www.waymarking.com/waymarks/WM15RX Waymarking.com] - "Missoula Flood Glacial Erratic, Tualatin, Oregon"] [http://vulcan.wr.usgs.gov/Volcanoes/Oregon/Portland/description_portland_vicinity.html USGS Cascades Volcano Observatory] ] As the west flowing flood waters rushed around Rocky Butte, a volcanic cinder cone in the Boring Lava Field, sediments were deposited on the west side of the butte forming an approximately 100 to convert|150|ft|m|sing=on high bar that became Alameda Ridge. The ridge extends west roughly six miles from Rocky Butte to approximately 15th Avenue and Skidmore Street.

Human History

Portland residents began building on Alameda Ridge around the turn of the 20th century, as electric streetcars allowed real estate development to grow away from the city core. The steep hillside on the south side of the ridge provides beautiful views of Northeast Portland and the downtown skyline. This allowed early developers to cater to wealthy individuals, and many early real estate agreements contained "whites only" provisions. [ [http://www.bluefish.org/inclouds.htm "Transportation Climbs Out of the Mud and Into the Clouds"] - Randy Gragg, the Oregonian, May 12, 2005.] ["Alameda Ridge Bike Cruise" - Urban Adventure League, self-published] Because the Ridge was developed before cars were the primary mode of transportation, many public stairways were built along the southern hillside to allow easier travel between neighborhoods. These stairways are still present today and are maintained by the City of Portland. Alameda Ridge runs through the Madison South, Rose City Park, Beaumont-Wilshire, Alameda, and Sabin Neighborhoods, with some of the most expensive homes (some being worth more than one million dollars) located along the upper edge of the southern slope in the Rose City Park, Beaumont, Alameda Neighborhoods.

Gallery

References

External links

* [http://www.movingtoportland.net/maps_boundary/map_pdxneighborhood.pdf Portland Neighborhood Map]
* [http://portlandconnected.com/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=102&MMN_position=102:14 Northeast Neighborhoods] - Portland Connected


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Alameda, Portland, Oregon — Infobox Neighborhood Portland OR neighborhood name = Alameda association name = Alameda Neighborhood Association association website = coalition name = Northeast Coalition of Neighborhoods coalition website = http://www.necoalition.org area =… …   Wikipedia

  • Alameda County, California — County of Alameda   County   René C. Davidson Courthouse, Alameda County Superior Court, Oakland …   Wikipedia

  • Alameda Creek — Geobox|River name = Alameda Creek native name = other name = category = stream etymology = nickname = image caption = country = United States state = California region = Alameda County region1 = Santa Clara County district = municipality = parent …   Wikipedia

  • National Register of Historic Places listings in Alameda County, California — Map of all coordinates from Google Map of all coordinates from Bing …   Wikipedia

  • Dinosaur Ridge — Tracks on Dinosaur Ridge Dinosaur Ridge is part of the Morrison Fossil Area National Natural Landmark located in Morrison, Colorado, just west of Denver. The Dinosaur Ridge area is one of the world s most famous dinosaur fossil localities. In… …   Wikipedia

  • Sobrante Ridge Regional Park — Sobrante Ridge Regional Park, or simply Sobrante Ridge, is a regional park of the East Bay Regional Parks District in Richmond, California. It covers convert|277|acre|km2|1 and protects the extremely endangered Alameda Manzanita, a native plant… …   Wikipedia

  • Beaumont-Wilshire, Portland, Oregon — Infobox Neighborhood Portland OR neighborhood name = Beaumont Wilshire association name = Beaumont Wilshire Neighborhood Association association website = http://www.bwna.org coalition name = Northeast Coalition of Neighborhoods coalition website …   Wikipedia

  • Neighborhoods of Portland, Oregon — The sections of Portland. There are 95 officially recognized Portland, Oregon neighborhoods. Each Portland neighborhood is represented by a volunteer based neighborhood association which serves as a liaison between residents of the neighborhood… …   Wikipedia

  • Columbia River Basalt Group — The Columbia River Basalt Group (including the Steen and Picture Gorge basalts) extends over portions of five states. The Columbia River Basalt Group is a large igneous province that lies across parts of the Western United States . It is found in …   Wikipedia

  • Sabin, Portland, Oregon — Infobox Neighborhood Portland OR neighborhood name = Sabin association name = Sabin Community Association association website = http://www.neighborhoodlink.com/portland/sabin/ coalition name = Northeast Coalition of Neighborhoods coalition… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”