The machine was 326 feet 99 m long and weighed 6,700 short tons 6,100 t. Drivers now travel underneath seattle inside a tunnel designed to survive strong earthquakes, with stateoftheart ventilation, fire suppression and intelligent traffic systems. Organization national society of professional engineers. Aurora avenue n due to mercer west and north portal construction. Less than a month until seattles alaskan way viaduct closes. Deep beneath seattle, our first endtoend trip in new tunnel shows massive scale of highway project. In seattle, we are the lead contractor for the sr 99 bored tunnel designbuild project. Improvements at the south portal area include full northbound and southbound access to and from sr 99 between s. Maintain efficient operations on the arterial street network. It is the largest doubledeck highway tunnel of its kind in the country, and features modern safety and operations systems.
The potential station would be included in either c01b or c01c, both of which include a tunnel alignment between the uptown. The sr 99 tunnel now averages more than a million trips each month. May 06, 2014 a map of major contracts within the program can be found here pdf 1. Fhwa center for innovative finance support project profiles. It wasnt too long ago that the future north portal of the sr 99 tunnel was just a few square blocks of vacant land at the north end of downtown seattle. Minimize sr 99 tunnel project construction impacts to. The safety systems will make the sr 99 tunnel one of the smartest tunnels ever built, including. New sr 99 deep bore tunnel project fact sheets and maps from wsdot cascadia center february 26, 2009 cascadia. Bertha, the sr 99 tunneling machine completed her first ft. Pedestrian and bicycle access bored tunnel alternative north portal. More than 300 cameras to monitor traffic and security at all times as part of an incidentdetection. Reconnects john and thomas streets across sr 99 and rebuilds a small section of. Acs will design and build the sr99 tunnel in seattle, with.
Related south and north tunnel portal access projects are underway and anticipated to be complete in 2017. Most of this work happened during the threeweek closure of sr 99 before the tunnel opened to drivers on feb. Aug 31, 2018 from the dark depths beneath seattle, bertha the sr 99 tunnel machine headed out of the muck and into daylight on tuesday, completing a final push in a yearslong effort to create space for a. Sr 99 tunnel project crews working for the washington state department of transportation have started construction for the sr 99 tunnel the replacement for the alaskan way viaduct. State route 99 sr 99, also known as the pacific highway, is a state highway in the seattle metropolitan area, part of the u. Sr 99 tunnel construction is starting north of downtown. North portal sr 99 tunnel project these photos highlight the work happening at the north portal of the alaskan way viaduct replacement program. Ut 01476 page 1 of 20 1 memorandum of agreement 2 ut 01476 3 sr 99 alaskan way viaduct replacement 4 scl facilities work agreement 5 for sr99 bored tunnel project 6 7 this memorandum of agreement, ut 01476, sr 99 alaskan way viaduct replacement, scl 8 facilities work agreement for sr99 bored tunnel project agreement is made and entered.
For about a month all traffic through seattle will be on surface streets or i5. The sr 99 tunneling machines new inner seals arrived from japan as scheduled this week. Near the tunnels north end, crews conducted final work to connect sr 99aurora avenue north to the tunnel. Keeping waterfront traffic moving during sr 99 tunnel. Dec 09, 2014 excavation continues on the circular pit pdf 2. Digging deeper into the alaskan way viaduct replacement. Viaduct planning less than a month until seattles alaskan. Washington state department of transportation oci was under contract with hntb, part of seattle tunnel partners, and developed site specific and construction phase specific tesc plans and narrative for the project. The tunnel will change the way traffic uses sr 99 in seattle. It is expected to complete operation in february 2017. The completed work will include an operations building, new on and offramps to aurora avenue north and the sr 99 tunnel, and a reconnected local street grid.
The team also built on and offramps at republican and harrison streets and extended sixth avenue north from harrison street to mercer street. Travel alternatives during approximate threeweek sr 99 closure, december 2018 pdf 0. Tunnel, and making improvements to the surface streets in the tunnels south and north portal areas. We also know that recent road and tunnel construction has challenged not only you and your neighbors, but also drivers looking for short. Major areas of concern for erosion and sediment transport on this project were the south and north portals, particularly the cut.
N temporary electrical substation water storage facility access shaft sr 99 tunnel project work site. Ballard was brought in early by seattle tunnel partners stp on this worldrecord setting project largest diameter. Tolling started in november 2019, and 83% of drivers using the tunnel today have a good to go. Fhwa center for innovative finance support project. Seattle tunnel partners 999 third avenue, suite 2424 seattle, wa 98104 january 15, 2014 washington state department of transportation alaskan way viaduct 999 third avenue, suite 2424 seattle, wa 98104 attn.
More than 300 cameras to monitor traffic and security at. Alaskan way viaduct replacement project 3 criteria that are less than onethird as stringent as todays criteria. North portal working group presentation may 21 2009. The route primarily follows arterial streets but has several freeway segments, including. Four injured in sr 99 tunnel project after wall collapse, 25foot fall posted 1. Acs will design and build the sr99 tunnel in seattle. To no ones surprise, the busiest travel times are the peak hours weekday mornings between 69 a. It runs 49 miles 79 km from fife in the south to everett in the north, passing through the cities of federal way, seatac, seattle, shoreline, and lynnwood. Looking south at the new sr 99 bridges, near seattles port and stadiums, and the construction bypass connection to the viaduct along the waterfront. The atkinson team constructed the sr 99 tunnel s north access entrance and exit roadways from the portal structure at harrison street to north of the mercer street bridge as part of the alaskan way viaduct replacement program. Access to downtown from sr 99 and from downtown to sr 99 are provided near s.
The program is designed to achieve the following goals in the pioneer square and waterfront neighborhoods. This video shows changes in access to the seattle ferry terminal during sr 99 tunnel construction. Pedestrian and bicycle access bored tunnel alternative. Our contractor for the north access project, guy f. Sr 99 tunnel north access connection atkinson construction. P sr 99 tunnel project parking mitigation program parking help is here. Sr 99 tunnel project construction timeline overpass open to traffic tunnel boring tunnel open north access project south atlantic street overpass south access project north surface street connections tunnel portals, cutandcover sections and operations buildings begin interior roadway construction central waterfront viaduct demolition. New sr 99 deep bore tunnel project fact sheets and maps. The atkinson team constructed the sr99 tunnels north access entrance and exit roadways from the portal structure at harrison street to north of the mercer street bridge as part of the alaskan way viaduct replacement program. It was made by hitachi zosen sakai works in osaka, japan, and the machines assembly was completed in seattle in june 20. The pieces, which are integral to seattle tunnel partners effort to repair the machine, were offloaded at terminal 46 and trucked a short distance north to the repair area. Alaskan way viaduct using the new sr 99 tunnel wsdot. The sr99 tunnel can work if it has enough traffic to prove its useful infrastructure but not too much traffic that its just another part of the.
Seattles sr 99 alaskan way tunnel progresses construction. Sr 99 tunnel project washington state department of. Designbuild project seattle tunnel partners joint venture of dragados usa and tutor perini corp. Apr 03, 2017 it wasnt too long ago that the future north portal of the sr 99 tunnel was just a few square blocks of vacant land at the north end of downtown seattle. Sr 99 tunnel alaskan way viaduct ballard marine construction. The stp team consulted with our hyperbaric support managers during the bidding process to develop a firstofitskind saturation habitat specifically for.
From the dark depths beneath seattle, bertha the sr 99 tunnel machine headed out of the muck and into daylight on tuesday, completing a final push in a yearslong effort to create space for a. A surveyor sets up his gear near the south end of the sr 99 tunnel on dec. These factors make the structure vulnerable to earthquakes and necessitate its removal. Bertha was designed and manufactured by hitachi zosen sakai works of osaka, japan, and is the worlds largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57. Sr99 tunnel north access connection clark construction. Our bored tunnel experience in the united states includes two projects in new york city for the emblematic east side access project, and the sr 99 bored tunnel project in seattle. Seattle tunnel partners engineers have determined that continuing excavation to 84 feet, an additional 3 feet from the current depth, will not affect when and how the dewatering wells could be turned off. Connection between the tunnel s north portal and aurora avenue n.
As part of the alaskan way viaduct replacement program, the atkinson team constructed the sr 99 tunnel s north access entrance and exit roadways from the portal structure at harrison street to north of the mercer street bridge. Nov 02, 2017 more than a year before the new state route 99 tunnel is scheduled to open to vehicles in seattle, i took a ride thursday from one end of the 2mile tube to the other, beneath this booming city. Seattle tunnel partners sr 99 bored tunnel alternative. Work occurring after the tunnel opens to traffic will reconnect the street grid just south of the tunnel portal. Two community open houses were held earlier this week, in ballard and west seattle, by the washington state department of transportation, king county dot, and the city of seattle dot. Mar 27, 2018 the safety systems will make the sr 99 tunnel one of the smartest tunnels ever built, including. Over the next five years private and public construction projects will continue to. The major infrastructure projects, including the sr 99 bored tunnel and seawall, all have. Sr 99 tunnel north portal and north operations building construction with labels in this labeled version of this october 2015 photo, the future north portal operations building is starting to take shape next to the pit where the sr 99 tunneling machine will break through at the end of its journey under downtown seattle. Sr 99 tunnel project construction timeline overpass open to traffic tunnel boring tunnel open north access project south atlantic street overpass south access project north surface street connections tunnel portals, cutandcover sections and operations buildings begin interior roadway construction central waterfront viaduct demolition all.
Alaskan way viaduct replacement sr 99 tunnel customer. This project would examine the additional cost, ridership and other evaluation criteria related to an additional tunnel station in the vicinity of sr 99 and harrison street. Seattles newest tunnel provides a direct route on sr 99 between the stadiums and the space needle. When the tunnel opens to vehicles, on and offramps will provide access to and from sr 99. Maintain access to downtown from aurora avenue north. Using the new sr 99 tunnel seattles new sr 99 tunnel. Atkinson construction, is busy building the connections between the future sr 99 tunnel and aurora avenue north, as well as new on and offramps at republican street.
Below are renderings of the north portals final configuration. Alaskan way viaduct the sr 99 tunnel contract youve. Alaskan way viaduct and seawall replacement project draft. Seattle urbanists should be rooting for the 99 tunnels. Building a new state route 99 through seattle, december 2018 pdf 5. Tunnel spoils conveyor belt operations building spoils removal barge this is available as an interactive map online at. Phase 1 of the downtown access strategy effort is intended to provide information. The tunnel boring machine began operation in july 20 and stopped while undergoing repairs from december 20 december 2015. Two lanes in each direction, plus an eightfoot safety shoulder. Sr 99 currently provides transit access into downtown from north and south. Egress corridors along the side of the state route 99 tunnel. Downtown access strategy phase 1 historic south downtown. Traveling sr 99 through seattle is much safer than it was pre tunnel, when the alaskan way viaduct carried sr 99 through the city. A map of major contracts within the program can be found here pdf 1.
Maintain andor enhance transit service and reliability. The state route 99 tunnel, also known as the alaskan way viaduct replacement tunnel, is a bored highway tunnel in the city of seattle, washington, united states. Appendix c, transportation discipline report, addresses the importance of the viaduct as a transportation. King street in the south and near harrison street in the north. The tunnel route starts near the stadiums and ends near aurora avenue north and harrison. Wsdot and partners and stakeholders created a program that identifies specific uses for those funds through 2018. Improve the urban character and reconnect adjacent neighborhoods. The bored tunnel alternative does provide access both through and to and from downtown. Ceilings on the lower deck stretch up 16 to 17 feeton the upper, arched roadway, they range anywhere from 16 to 22 at its peak. Near the tunnel s north end, crews conducted final work to connect sr 99 aurora avenue north to the tunnel. Mar 27, 2018 egress corridors along the side of the state route 99 tunnel. Stormwater control, signage and roadway restoration. Deep beneath seattle, our first endtoend trip in new tunnel.
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