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• Vista_Ridge_Tunnels abstract "The Vista Ridge Tunnels are highway tunnels through the Tualatin Mountains ("West Hills") of Portland, Oregon, USA. Located in the Goose Hollow neighborhood, the tunnels pass through a hillside locally known as Vista Ridge which is a half mile (1 km) west of downtown Portland. Sunset Highway, also known as U.S. Route 26, is carried through the tunnels, three lanes in each direction. They are Oregon's busiest tunnels.The eastbound tunnel is 1001.0 feet (305 m) in length; the westbound tunnel is 949 feet (289 m). Both have 41 ft (12.5 m) of horizontal and 15.58 ft (4.75 m) of vertical clearance. The eastbound tunnel was completed in 1969, the westbound a year later.There is a six-percent grade through the tunnels. Most of the tunnels' lengths are straight, though they curve southward at the west ends 35°.The tunnels were built with ventilation shafts which were never used. Instead, the shafts were later adapted for electrical wiring, so as to improve tunnel illumination without marring the tunnels' appearance with visible conduit.To improve tunnel safety for motorists, and decrease the tunnel lighting requirements, the original tunnel entrance faces were sandblasted to remove white paint and repainted a less luminescent tan color to reduce the range of visual light adaptation required by drivers. At one time there were computer-based electronic light controls, but they were replaced by relatively simple photo detectors and relays for durability and simplicity. The night lighting level is enabled permanently and is supplemented by two or three levels of daytime lighting.Except directly over the tunnels, the hillsides are steep and undeveloped forest, with some residential development along the top of the ridges. Landslides occasionally occur, but are usually minor and quickly cleared.The tunnels have been closed to hazardous material transport since November 1, 1994.As a result, US 26 is closed to hazardous material transport between I-405 and Oregon Route 217.The tunnels are located nearly at the bottom of a hill where the road gradient averages 6.5% over 2.25 mi (3.6 km). Close to the east portals is a 130 foot (40 m) tunnel underpass carrying SW 18th Avenue. Just outside the west portals is a 650 foot (200 m) tunnel under the lanes which carries eastbound Canyon Roadfrom the exit ramp into Goose Hollow. The Robertson Tunnel for MAX Light Rail is underground approximately 800 feet (250 m) to the west.".
• Vista_Ridge_Tunnels location Oregon.
• Vista_Ridge_Tunnels location Portland,_Oregon.
• Vista_Ridge_Tunnels numberOfLanes "63".
• Vista_Ridge_Tunnels openingYear "1969".
• Vista_Ridge_Tunnels owner Oregon_Department_of_Transportation.
• Vista_Ridge_Tunnels speedLimit "80.467".
• Vista_Ridge_Tunnels status "operational".
• Vista_Ridge_Tunnels thumbnail Vista_Ridge_Tunnels_east_end_P2236a.jpeg?width=300.
• Vista_Ridge_Tunnels wikiPageExternalLink Traffic_Volume_Tables.
• Vista_Ridge_Tunnels wikiPageExternalLink Cam.asp?camera=529&curRegion=16.
• Vista_Ridge_Tunnels wikiPageID "12543871".
• Vista_Ridge_Tunnels wikiPageRevisionID "553448719".
• Vista_Ridge_Tunnels caption "The east end of the Vista Ridge Tunnels face downtown Portland and are under a residential neighborhood.".
• Vista_Ridge_Tunnels character "Limited access highway".
• Vista_Ridge_Tunnels hasPhotoCollection Vista_Ridge_Tunnels.
• Vista_Ridge_Tunnels lanes "63".
• Vista_Ridge_Tunnels location Oregon.
• Vista_Ridge_Tunnels location Portland,_Oregon.
• Vista_Ridge_Tunnels name "Vista Ridge Tunnels".
• Vista_Ridge_Tunnels open "1969".
• Vista_Ridge_Tunnels owner Oregon_Department_of_Transportation.
• Vista_Ridge_Tunnels speed "50.0".
• Vista_Ridge_Tunnels status "operational".
• Vista_Ridge_Tunnels traffic "Automotive".
• Vista_Ridge_Tunnels subject Category:1969_establishments_in_Oregon.
• Vista_Ridge_Tunnels subject Category:Buildings_and_structures_in_Portland,_Oregon.
• Vista_Ridge_Tunnels subject Category:Transportation_in_Portland,_Oregon.
• Vista_Ridge_Tunnels subject Category:Tunnels_completed_in_1970.
• Vista_Ridge_Tunnels subject Category:Tunnels_in_Oregon.
• Vista_Ridge_Tunnels point "45.5158 -122.6991".
• Vista_Ridge_Tunnels type Artifact100021939.
• Vista_Ridge_Tunnels type Object100002684.
• Vista_Ridge_Tunnels type Passage103895293.
• Vista_Ridge_Tunnels type Passageway103895585.
• Vista_Ridge_Tunnels type PhysicalEntity100001930.
• Vista_Ridge_Tunnels type Tunnel104497962.
• Vista_Ridge_Tunnels type TunnelsCompletedIn1970.
• Vista_Ridge_Tunnels type TunnelsInOregon.
• Vista_Ridge_Tunnels type Way104564698.
• Vista_Ridge_Tunnels type Whole100003553.
• Vista_Ridge_Tunnels type YagoGeoEntity.
• Vista_Ridge_Tunnels type YagoPermanentlyLocatedEntity.
• Vista_Ridge_Tunnels type ArchitecturalStructure.
• Vista_Ridge_Tunnels type Infrastructure.
• Vista_Ridge_Tunnels type Place.
• Vista_Ridge_Tunnels type RoadTunnel.
• Vista_Ridge_Tunnels type RouteOfTransportation.
• Vista_Ridge_Tunnels type Wikidata:Q532.
• Vista_Ridge_Tunnels type Place.
• Vista_Ridge_Tunnels type Location.
• Vista_Ridge_Tunnels type _Feature.
• Vista_Ridge_Tunnels type SpatialThing.
• Vista_Ridge_Tunnels comment "The Vista Ridge Tunnels are highway tunnels through the Tualatin Mountains ("West Hills") of Portland, Oregon, USA. Located in the Goose Hollow neighborhood, the tunnels pass through a hillside locally known as Vista Ridge which is a half mile (1 km) west of downtown Portland. Sunset Highway, also known as U.S. Route 26, is carried through the tunnels, three lanes in each direction.".
• Vista_Ridge_Tunnels label "Vista Ridge Tunnels".
• Vista_Ridge_Tunnels sameAs m.02wcggh.
• Vista_Ridge_Tunnels sameAs Q7936461.
• Vista_Ridge_Tunnels sameAs Q7936461.
• Vista_Ridge_Tunnels sameAs Vista_Ridge_Tunnels.
• Vista_Ridge_Tunnels lat "45.5158".
• Vista_Ridge_Tunnels long "-122.6991".
• Vista_Ridge_Tunnels wasDerivedFrom Vista_Ridge_Tunnels?oldid=553448719.
• Vista_Ridge_Tunnels depiction Vista_Ridge_Tunnels_east_end_P2236a.jpeg.
• Vista_Ridge_Tunnels isPrimaryTopicOf Vista_Ridge_Tunnels.
• Vista_Ridge_Tunnels name "Vista Ridge Tunnels".