605 feet (184 m) approx. 6,000 feet (1,800 m) inside west portal[4]
Lowest elevation
220 feet (67 m) at east portal[4]
The Robertson Tunnel is a twin-bore light rail tunnel through the Tualatin Mountains west of Portland, Oregon, United States, used by the MAX Blue and Red Lines. The tunnel is 2.9 miles (4.7 kilometers) long[1] and consists of twin 21-foot-diameter (6.4 m) tunnels. There is one station within the tunnel at Washington Park, which at 259 feet (79 m) deep is the deepest subway station in the United States and the fifth-deepest in the world.[5] Trains are in the tunnel for about 5 minutes, which includes a stop at the Washington Park station. The tunnel has won several worldwide engineering and environmental awards.[6] It was placed into service September 12, 1998.[7]
The tunnels pass through basalt layers up to 16 million years old. Due to variations in the rock composition, the tunnel curves mildly side to side and up and down to follow the best rock construction conditions.[8] The tunnels vary from 80 to 300 feet (24–91 m) below the surface. A core sample taken during construction is on display with a timeline of local geologic history.[9]
The east tunnel entrance is near Vista Bridge at the edge of the Goose Hollow neighborhood at the foot of Washington Park. The west entrance is along U.S. Highway 26 just west of the Finley-Sunset Hills cemetery, about a mile east of the junction with Oregon Highway 217.[10]
^ abLight Rail and Modern Tramway, November 1993, p. 302. UK: Ian Allan Publishing/Light Rail Transit Association.
^Mark Kavanagh. "Portland Transit–MAX Light Rail". Kavanagh Transit Systems. Archived from the original on March 29, 2007. Retrieved July 30, 2007.
^Kinh D. Pham; Ralph S. Thomas; Xavier Ramirez. "Traction Power Supply for the Portland Interstate MAX Light Rail Extension" (PDF). Transportation Research Board. Retrieved July 29, 2007.
^ abTrimet Capital Projects and Facilities Division (August 2011). "TriMet Portland to Milwaukie LRT Type 5 LRV, Contract No. RH120160BW Reference Drawings, Request for Proposal" (PDF). pp. 7–8.
^"The world's deepest subway stations". The Moscow News. December 1, 2012. Archived from the original on March 1, 2014. Retrieved March 20, 2013.
^"Awards & Recognition". TriMet. Retrieved July 30, 2007.
^"Westside MAX Blue Line Project History". TriMet. Archived from the original on September 27, 2007. Retrieved July 30, 2007.
^"Westside light rail—the MAX Blue Line extension" (PDF). Retrieved July 26, 2007.
^"Portland MAX: East-West MAX (Blue)". world.nycsubway.org. Archived from the original on February 12, 2007. Retrieved August 3, 2007.
^Sam's. "Tunneling and Civil Engineering". Archived from the original on September 27, 2007. Retrieved July 26, 2007.
The RobertsonTunnel is a twin-bore light rail tunnel through the Tualatin Mountains west of Portland, Oregon, United States, used by the MAX Blue and...
public airport RobertsonTunnel, Portland, Oregon, a light rail transit tunnelRobertson County, Tennessee Robertson County, Texas Robertson Stadium, University...
important role in local affairs, including the development of the RobertsonTunnel, recreation, and nature parks. Because of the field's proximity to...
Tunnel, an active rail tunnel located near Hayden. Jefferson Tunnel, abandoned rail tunnel in Jefferson County. Laney Tunnel, an active rail tunnel on...
stop westbound on the Westside MAX. This is the first stop after the RobertsonTunnel under Portland's West Hills. Sunset TC is the second-busiest station...
August with the excavation of the RobertsonTunnel. The Westside MAX opened in two stages following delays in tunneling: the section from 11th Avenue to...
the Sunset Highway before entering the RobertsonTunnel for Washington Park station. After leaving the tunnel, the line passes below the Vista Bridge...
into Goose Hollow. The RobertsonTunnel for MAX Light Rail is underground approximately 800 feet (250 m) to the west. The tunnels have been closed to hazardous...
Elizabeth Anderson and sculpted by Bill Bane, the other images are the RobertsonTunnel that runs through the West Hills, Mount Hood, the Oregon Convention...
The RobertsonTunnel is a tunnel through the west hills of Portland, Oregon, U.S. for the TriMet public transit MAX Light Rail system. The tunnel is 3...
Government of Solberg. Robertson, Heidi (2014-01-08). "Salten ønsker tunnel gjennom Tjernfjellet forsert" [Salten wants a tunnel through Tjernfjellet forced]...
plan by the United States Federal Bureau of Investigation (FBI) to build a tunnel underneath the Soviet Embassy in Washington, D.C., to gather secret intelligence...
than that of the original Robertson–Schrödinger uncertainty relation. Thus, we need to calculate the bound of the Robertson–Schrödinger uncertainty for...
of Miami Tunnel (also State Road 887) is a 4,200-foot (1,300 m) bored, undersea tunnel in Miami, Florida. It consists of two parallel tunnels (one in each...
Made by InCA. 18 September Taking the Tunnel, who would be travelling through the Channel Tunnel; the tunnel would open in May 1993; Colin Kirkland,...
much of the regional transportation infrastructure, including bridges, tunnels, airports, and seaports, within the geographical jurisdiction of the Port...
Road Tunnel (SMART Tunnel) project – a 50:50 joint venture collaboration with MMC Corporation Berhad. Completed in year 2007, this 9.7 km SMART tunnel primary...
authorities to put the rail line in a tunnel instead of running it as a surface route, and to dig the tunnel using a tunnel boring machine. However, due to...
their betrayal. Hanssen also revealed a multimillion-dollar eavesdropping tunnel built by the FBI under the Soviet Embassy. After Ames's arrest in 1994,...
com. Retrieved September 12, 2013. Robertson, p. 7. Robertson, p. 8. Robertson, p. 10. Robertson, pp. 9–16. Robertson refers to multiple bachelor uncles...