Main Street Bridge (Hillsboro, Oregon)
From Wikipedia, the free encyclopedia
| Main Street Bridge | |
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| Carries | light rail |
| Crosses | Main Street & 18th Avenue |
| Locale | Hillsboro, Oregon United States |
| Maintained by | TriMet |
| Design | concrete arch/tied-arch |
| Total length | 425 feet (130 m) |
| Width | 34 feet (10.3 m) |
| Height | 75 feet (arch) |
| Opening date | 1997 |
Main Street Bridge is a tied concrete arch bridge located in Hillsboro, Oregon, United States. The bridge carries light rail traffic over Main Street and 18th Street on TriMet’s MAX Blue Line that runs from Gresham to Hillsboro. Completed in 1997, the 425 foot long bridge was built with a 78 foot tall arch in the center. It is located between the 12th Avenue Station and the Fair Complex Station.
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[edit] Design
The bridge is a post-tension box girder structure with the center pier as an arch support straddling the road.[1] Used in lieu of a center support, the arch is 110 feet wide[1] and 75 feet tall.[2] Six cables measuring four inches in diameter run from the arch to the main structure of the bridge at the center.[2] The two ends of the reinforced concrete arch are connected to each other underground using a post-tension tie beam, making the structure a tied arch.[1]
[edit] History
After more than a decade of studies and designing, construction on the Westside MAX light rail line began in 1993.[3] In 1997, construction on the Main Street Bridge began. The bridge was designed by BRW to cross what is planned to be five lanes of traffic on Main Street.[2] The city of Hillsboro required the bridge to be able to cross over the planned widening of the roadway without using a center support column to avoid accidents that had plagued a previous train crossing of the Oregon Electric Railway at the same location.[2][3] In September 1997, the construction of the bridge structure was completed.[4] The “golden spike” of the Westside light rail line was driven with the final pieces of track of the project installed on this bridge in October 1997.[5] Passenger service on the $964 million project began on September 12, 1998.[5]
[edit] References
- ^ a b c Cortright, Robert. 2003. Bridging the World. Wilsonville, Or: Bridge Ink.
- ^ a b c d Arch support for Tri-Met extension; engineers in Hillsboro, OR constructed a 75-ft high concrete arch over a roadway without using a center support, so that the arch can support bridge cables for the light rail overpass; Transit Update. Railway Age, November 1997 No. 11, Vol. 198; Pg. 27; ISSN: 0033-8826
- ^ a b Westside light rail the MAX Blue Line extension. TriMet. Retrieved on October 8, 2007.
- ^ Oliver, Gordon and Don Hamilton. MAX moves west new rail stations will go on-line. The Oregonian, August 29, 1997.
- ^ a b Oliver, Gordon and Don Hamilton. Go west young MAX. The Oregonian, September 9, 1998.
[edit] External links
- Benjamin, Adam J. Portland MAX: East-West MAX (Blue). world.nycsubway.org
- Main Street Bridge (Hillsboro, Oregon) is at coordinates Coordinates:
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| Government |
Police · City Hall · Library · County Courthouse · Clean Water Services |
| Transportation |
MAX Blue Line · Main Street Bridge · Airport · Oregon Route 219 · T.V. Highway · Sunset Highway |
| Education |
Hillsboro School District · Century High School · Glencoe High School · Hillsboro High School · Liberty High School · Hare Field · OGI School of Science and Engineering |
| Companies |
FEI · Intel · Lattice · Metro West Ambulance · Parr Lumber · Planar · RadiSys · Rodgers Instruments · Tuality Healthcare |
| Parks & Recreation |
Hillsboro Stadium · Hondo Dog Park · Noble Woods Park · Shute Park · Jackson Bottom · Oregon International Airshow · |
| Other |
The Argus · Glencoe · David Hill · KUIK · Orenco · Orenco Station · Pioneer Cemetery · Primate Research Center · Tanasbourne |
