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Bridal Veil Falls Bridge
The Bridal Veil Falls is a waterfall located on Bridal Veil Creek along the Columbia River Gorge in Multnomah County, Oregon, United States. The waterfall is accessible from the historic Columbia River Highway and Interstate 84. Spanning two tiers on basalt cliffs, it is the only waterfall which occurs below the historic Columbia Gorge Scenic Highway. The Bridal Veil Falls Bridge, built in 1914, crosses over the falls, and is listed on the National Register of Historic Places. Structure The falls drops in two major steps, split into an upper falls and a lower falls with a total height of the waterfall at . The two drops are due to a zone of more easily eroded basalt defile at the base of the upper falls. A massive basalt boulder detached from the cliff and lies in the creek along the pool below. Water source Underground springs from Larch Mountain are the year-round source of water for the waterfall, augmented by spring runoff from the mountain's snowpack and rainwater during ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whitewater Kayaking
Whitewater kayaking is an adventure sport where a river is navigated in a decked kayak. Whitewater kayaking includes several styles. River running; where the paddler follows a river and paddles rapids as they travel. Creeking usually involving smaller, steeper, and more technical waterways. Creek boats tend to be short but high volume to allow for manoeuvrability while maintaining buoyancy. Slalom requires paddlers to navigate through "gates" (coloured poles hanging above the river). Slalom is the only whitewater event to be in the Olympics. Play boating involves staying on one feature of the river and is more artistic than the others. Squirt boating uses low-volume boats (usually made specifically for the paddler) to perform special moves in whitewater features. History Paddling on rivers, lakes and oceans is as old as the Stone Age. The raft, the catamaran, the canoe and the kayak evolved depending on the needs and environment of the indigenous peoples in different parts of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reinforced-concrete
Reinforced concrete (RC), also called reinforced cement concrete (RCC) and ferroconcrete, is a composite material in which concrete's relatively low tensile strength and ductility are compensated for by the inclusion of reinforcement having higher tensile strength or ductility. The reinforcement is usually, though not necessarily, steel bars (rebar) and is usually embedded passively in the concrete before the concrete sets. However, post-tensioning is also employed as a technique to reinforce the concrete. In terms of volume used annually, it is one of the most common engineering materials. In corrosion engineering terms, when designed correctly, the alkalinity of the concrete protects the steel rebar from corrosion. Description Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and/or structural failure. Modern reinforced concrete can contain varied reinforcing materials made of s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parks In Multnomah County, Oregon
A park is an area of natural, semi-natural or planted space set aside for human enjoyment and recreation or for the protection of wildlife or natural habitats. Urban parks are green spaces set aside for recreation inside towns and cities. National parks and country parks are green spaces used for recreation in the countryside. State parks and provincial parks are administered by sub-national government states and agencies. Parks may consist of grassy areas, rocks, soil and trees, but may also contain buildings and other artifacts such as monuments, fountains or playground structures. Many parks have fields for playing sports such as baseball and football, and paved areas for games such as basketball. Many parks have trails for walking, biking and other activities. Some parks are built adjacent to bodies of water or watercourses and may comprise a beach or boat dock area. Urban parks often have benches for sitting and may contain picnic tables and barbecue grills. The largest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waterfalls Of Multnomah County, Oregon
A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. Waterfalls can be formed in several ways, but the most common method of formation is that a river courses over a top layer of resistant bedrock before falling on to softer rock, which erodes faster, leading to an increasingly high fall. Waterfalls have been studied for their impact on species living in and around them. Humans have had a distinct relationship with waterfalls for years, travelling to see them, exploring and naming them. They can present formidable barriers to navigation along rivers. Waterfalls are religious sites in many cultures. Since the 18th century they have received increased attention as tourist destinations, sources of hydropower, andparticularly since the mid-20th centuryas subjects of research. Definition and terminology A waterfall is general ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cascade Waterfalls
A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. Waterfalls can be formed in several ways, but the most common method of formation is that a river courses over a top layer of resistant bedrock before falling on to softer rock, which erodes faster, leading to an increasingly high fall. Waterfalls have been studied for their impact on species living in and around them. Humans have had a distinct relationship with waterfalls for years, travelling to see them, exploring and naming them. They can present formidable barriers to navigation along rivers. Waterfalls are religious sites in many cultures. Since the 18th century they have received increased attention as tourist destinations, sources of hydropower, andparticularly since the mid-20th centuryas subjects of research. Definition and terminology A waterfall is generally d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Bridges On The National Register Of Historic Places In Oregon
This is a list of bridges and tunnels on the National Register of Historic Places in the U.S. state of Oregon. It includes a number of viaducts which are considered bridges. A list of bridges, tunnels, and viaducts of the Historic Columbia River Highway is included. __TOC__ Gray shading indicates that a structure has been removed from the Register. Often the road listed in the "location" column now parallels the bridge on a new one, and the old bridge is closed to traffic. Bridges and tunnels besides in Historic Columbia River Highway Historic Columbia River Highway bridges and tunnels These are contributing structures in the Historic Columbia River Highway, which was listed on the National Register of Historic Places in 1983, and was further designated a National Historic Landmark District in 2000. With See also *List of Oregon covered bridges *List of bridges in the United States References * (does not include places no longer listed)Oregon National Register List No ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Bridges Documented By The Historic American Engineering Record In Oregon
__NOTOC__ This is a list of bridges documented by the Historic American Engineering Record in the US state of Oregon. Bridges See also *List of tunnels documented by the Historic American Engineering Record in Oregon Notes References {{HAER list, structure=bridge *List *List Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ... Bridges, HAER Bridges, HAER ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paper Mill
A paper mill is a factory devoted to making paper from vegetable fibres such as wood pulp, old rags, and other ingredients. Prior to the invention and adoption of the Fourdrinier machine and other types of paper machine that use an endless belt, all paper in a paper mill was made by hand, one sheet at a time, by specialized laborers. History Historical investigations into the origin of the paper mill are complicated by differing definitions and loose terminology from modern authors: Many modern scholars use the term to refer indiscriminately to all kinds of mills, whether powered by humans, by animals or by water. Their propensity to refer to any ancient paper manufacturing center as a "mill", without further specifying its exact power source, has increased the difficulty of identifying the particularly efficient and historically important water-powered type. Human and animal-powered mills The use of human and animal powered mills was known to Muslim and Chinese paperma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bridal Veil, Oregon
Bridal Veil is a virtual ghost town located in Multnomah County, Oregon, United States. It was established in the 1880s during a logging boom by a logging company as it harvested timber on nearby Larch Mountain to be a company mill town around a sawmill. It had a close relationship with the logging town of Palmer for the first 50 years of its history. As of November 2011, all that remains of the town is a post office and a cemetery. The site is located near the west end of the Columbia River Gorge. History Bridal Veil was established in 1886. Bridal Veil functioned as the Bridal Veil Falls Lumbering Company and built a sawmill one mile (1.6 km) up Larch Mountain. The company operated in Bridal Veil and the surrounding area from 1886 to 1936. A mile and half up the timber-rich mountain was the logging town of Palmer. Palmer and Bridal Veil shared common ownership as company mill towns. Together, the two towns produced lumber and were codependent. A V-shaped log flume was b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veil
A veil is an article of clothing or hanging cloth that is intended to cover some part of the head or face, or an object of some significance. Veiling has a long history in European, Asian, and African societies. The practice has been prominent in different forms in Judaism, Christianity, and Islam. The practice of veiling is especially associated with women and sacred objects, though in some cultures, it is men, rather than women, who are expected to wear a veil. Besides its enduring religious significance, veiling continues to play a role in some modern secular contexts, such as wedding customs. Etymology The English word ''veil'' ultimately originates from Latin '' vēlum'', which also means " sail," from Proto-Indo-European ''*wegʰslom'', from the verbal root ''*wegʰ-'' "to drive, to move or ride in a vehicle" (compare ''way'' and ''wain'') and the tool/instrument suffix ''*-slo-'', because the sail makes the ship move. Compare the diminutive form ''vexillum'', and the Sla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Park Service
The National Park Service (NPS) is an agency of the United States federal government within the U.S. Department of the Interior that manages all national parks, most national monuments, and other natural, historical, and recreational properties with various title designations. The U.S. Congress created the agency on August 25, 1916, through the National Park Service Organic Act. It is headquartered in Washington, D.C., within the main headquarters of the Department of the Interior. The NPS employs approximately 20,000 people in 423 individual units covering over 85 million acres in all 50 states, the District of Columbia, and US territories. As of 2019, they had more than 279,000 volunteers. The agency is charged with a dual role of preserving the ecological and historical integrity of the places entrusted to its management while also making them available and accessible for public use and enjoyment. History Yellowstone National Park was created as the first national par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deck Girders
A girder bridge is a bridge that uses girders as the means of supporting its deck. The two most common types of modern steel girder bridges are plate and box. The term "girder" is often used interchangeably with "beam" in reference to bridge design. However, some authors define beam bridges slightly differently from girder bridges. A girder may be made of concrete or steel. Many shorter bridges, especially in rural areas where they may be exposed to water overtopping and corrosion, utilize concrete box girder. The term "girder" is typically used to refer to a steel beam. In a beam or girder bridge, the beams themselves are the primary support for the deck, and are responsible for transferring the load down to the foundation. Material type, shape, and weight all affect how much weight a beam can hold. Due to the properties of the second moment of area, the height of a girder is the most significant factor to affect its load capacity. Longer spans, more traffic, or wider spacing o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
