27:
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Ground was broken for the new tunnel on May 6, 2005. Boring of twin 30-foot (9 m) diameter tunnels started
September 17, 2007, and was completed in 2011. Breakthrough on the northern bore occurred on September 30, 2010. With the completion of the tunnels in 2013, the old Devil's Slide highway
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A major slide in 1983 brought the problem to the public attention again. In 1985 Caltrans proposed the
Martini Creek bypass as the preferred solution. However, the Sierra Club sued to stop construction, as California law requires that State Route 1 be restricted to two lanes in
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A five-month outage caused by a slide in
January 1995 again brought public scrutiny to the stretch of highway. In April, Caltrans documents were discovered that showed the agency had intentionally overestimated the costs of a tunnel, to support the freeway bypass. In July, the
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by 76%, changing the county's stated preference from construction of the bypass to construction of a tunnel. On
November 9, Caltrans changed its position, supporting a bridge and tunnel as the best environmental, economic, and popular alternative to Devil's Slide.
293:, as they are usually called, are the second and third longest road tunnels in California at 4,149 ft (1,265 m) northbound, and 4,008 ft (1,222 m) southbound. By comparison the longest road tunnel currently in California, the
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A bypass was proposed to be constructed to replace the 600-foot (180 m) stretch of highway. Beginning in 1958, California began the process to replace Devil's Slide with an inland route over
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471:"SAN MATEO COUNTY / Tunnel was devil of a fight / Caltrans breaks ground today on long-sought bypass at notorious slide"
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ordered
Caltrans to re-evaluate a tunnel to bypass Devil's Slide. On November 5, 1996, San Mateo County voters approved
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study in 1974 determined that a tunnel would be a viable alternative to the current road or a proposed inland
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had been acquired, when work on the proposed bypass was abandoned due to public opposition.
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areas. The 101-foot-wide (31 m) road bed, complete with continuous uphill
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for hikers and bicyclists. The tunnels opened to traffic on March 26, 2013.
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on
Highway 41 in Yosemite National Park, is 4,233 ft (1,290 m).
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Transportation buildings and structures in San Mateo County, California
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Analyses for the Bypass
Alternative, Devil's Slide Improvement Project
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Area Along
Highway One, San Mateo County, California, by Dewatering
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bypass. However, the state dropped the idea in the late 1970s.
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proposed building a tunnel to bypass the road in 1973. A
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as a more environmentally sensitive alternative to the
276:. They are officially named after late Congressman
596:Caltrans page for the Devil's Slide tunnel project
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416:
419:"Devil's Slide tunnel work falls behind schedule"
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344:went through the area, but was destroyed during
606:KQED QUEST photo montage and article on tunnel
562:A Study of the Feasibility of Stabilizing the
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536:District 4, prepared by Earth Metrics Inc.,
340:Bypass. A short tunnel built in 1908 by the
268:, United States, created to allow rerouting
590:Caltrans Office of Geotechnical Design West
445:"Workers break through tunnel preemptively"
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256:are two tunnels located within the coastal
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25:
548:, California, Draft Second Supplemental
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304:
497:"Devil's Slide Tunnel to open March 26"
272:to avoid a portion of roadway known as
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1115:Tunnels in the San Francisco Bay Area
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495:Michael Cabanatuan (14 March 2013).
417:Michael Cabanatuan (4 August 2011).
264:, on the San Francisco Peninsula in
544:Devil's Slide Improvement Project,
332:Most environmentalists supported a
321:. The bypass bisected a section of
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524:Michael Hogan and Ballard George,
518:
14:
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443:Lily Bixler (14 February 2012).
348:, to keep it from being used by
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560:Hovland, John H., Ph.D., P.E.,
550:Environmental Impact Statement
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436:
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385:Federal Highway Administration
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1:
710:Silicon Valley BART extension
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219:c. 20 m (66 ft) msl
211:c. 30 m (98 ft) msl
571:Woodward-Clyde Consultants,
286:named after their location.
7:
501:The San Francisco Chronicle
475:The San Francisco Chronicle
423:The San Francisco Chronicle
31:Northbound tunnel entrances
10:
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1125:Road tunnels in California
577:Study – Feasibility Report
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203:45 mph (72 km/h)
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1120:California State Route 1
889:Summit Tunnel (proposed)
469:Ryan Kim (May 6, 2005).
449:The Half Moon Bay Review
309:Interior of the tunnels
229:6.8 m (22 ft)
1038:Robin Williams (Waldo)
643:San Francisco Bay Area
323:McNee Ranch State Park
310:
396:was converted into a
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291:Devil's Slide tunnels
237:9 m (30 ft)
181:4,008 ft (southbound)
179:4,149 ft (northbound)
1110:Pacifica, California
692:Fremont Central Park
592:engineering analysis
342:Ocean Shore Railroad
319:Martini Creek Bypass
76:37.5772°N 122.5125°W
47:Pacifica, California
148:State of California
72: /
21:
843:Puerto Suello Hill
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254:Tom Lantos Tunnels
111:(Cabrillo Highway)
81:37.5772; -122.5125
20:Tom Lantos Tunnels
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1017:Posey and Webster
975:Southern Crossing
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557:District 4 (1999)
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208:Highest elevation
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579:, October, 1996.
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526:Air Quality and
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315:Montara Mountain
262:Montara Mountain
225:Tunnel clearance
216:Lowest elevation
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688:Berkeley Subway
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641:Tunnels in the
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200:Operating speed
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584:External links
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573:Devil’s Slide
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961:Geary–Masonic
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568:, April, 1998
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295:Wawona Tunnel
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274:Devil's Slide
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270:State Route 1
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865:Pacheco Pass
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666:Niles Canyon
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504:. Retrieved
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452:. Retrieved
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426:. Retrieved
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331:
327:right-of-way
312:
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253:
251:
1033:Baker–Barry
1008:Ferry Point
988:Yerba Buena
879:Valley Link
703:Oakland Wye
540:, CA (1984)
357:Sierra Club
346:Prohibition
129:Constructed
124:May 6, 2005
79: /
67:122°30′45″W
54:Coordinates
1099:Categories
1054:Tom Lantos
977:(proposed)
956:(proposed)
867:(proposed)
819:(proposed)
817:The Portal
792:Twin Peaks
773:(proposed)
763:(proposed)
761:Fort Mason
746:Muni Metro
538:Burlingame
404:References
278:Tom Lantos
266:California
258:promontory
195:1 per bore
166:Automotive
121:Work begun
64:37°34′38″N
1084:Mile Rock
1074:Claremont
1047:Peninsula
1026:North Bay
1012:Northbrae
1004:Caldecott
965:MacArthur
899:Abandoned
564:Landslide
389:Measure T
353:smugglers
242:Route map
171:Technical
132:2005–2013
116:Operation
109:SR 1
997:East Bay
983:Stockton
954:Fillmore
947:Broadway
802:Caltrain
736:Franklin
718:Transbay
555:Caltrans
534:Caltrans
506:21 March
480:21 March
454:21 March
428:21 March
361:Caltrans
283:de facto
157:Caltrans
153:Operator
95:Complete
42:Location
37:Overview
1067:Utility
911:Wrights
754:Central
365:freeway
350:alcohol
301:History
163:Traffic
16:Tunnels
787:Sunset
780:Market
712:(2036)
697:Market
575:Tunnel
355:. The
334:tunnel
176:Length
137:Opened
92:Status
854:CAHSR
830:SMART
771:Geary
528:Noise
398:trail
373:rural
234:Width
191:lanes
145:Owner
100:Route
45:Near
933:Road
906:Alto
728:BNSF
676:BART
650:Rail
508:2013
482:2013
456:2013
430:2013
289:The
252:The
658:ACE
260:of
189:of
187:No.
1101::
553:,
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634:e
627:t
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