Viaduct, SR 519, Spokane Street
Three road projects with big impacts will be the
subjects of updates Thursday, noon to 1:30 p.m., at the Mezza Café inside
the Starbucks building at First and Lander. The meeting is open to the
public and is cosponsored by the SODO Business Association and the
Duwamish Transportation Management Association.
Updates will be
provided by state and city transportation departments regarding the
Alaskan Way Viaduct project. State Route 519, 1st Avenue South repaving
and the widening of the Spokane Street Viaduct.
Lunch will be
provided. Donations are accepted.
The Mezza Café is at 2401 Utah
Ave, 3rd Floor.
Ballard Forum on Deep Bore Tunnel
The proposal to replace
the Alaskan Way Viaduct with a deep bore tunnel is the subject of a
community forum Monday, March 23, 7-9 pm at the Ballard High School
Auditorium. The forum is, cosponsored by the district councils of
Magnolia, Queen Ann and Ballard and the BINMIC Action
WSDOT Answers Your
The March question from
you is: Will the bored tunnel be safe during an earthquake and other
Geotechnical and structural engineers agree
that tunnels can be designed as one of the safest places to be during an
earthquake. This is because ground movements below the surface are much
smaller than the amplified movements above the surface. This tunnel will
be designed and built to current seismic standards, which require
structures to withstand a severe earthquake with a probability of
occurring only once every thousand years.
Both levels of the
tunnel will include outside shoulders to allow disabled vehicles to stop
and to improve access for emergency vehicles. Inside shoulders will
provide increased sight distances, and two 12-foot travel lanes will
ensure adequate space for even the largest highway trucks of legal size.
Secure waiting areas between the tunnel's levels, known as safe
refuge areas, and emergency exits will be provided by an enclosed walkway.
Access to the refuge area and walkways will be provided at least every 650
feet. In the event of a fire or other emergency, travelers will walk along
the shoulders to reach the doorways into the refuge area. Staircases
inside the refuge area will provide access between the roadway levels.
Signs will point travelers to the nearest exit where they will wait for
assistance in a refuge area or walk out of the tunnel.
The SR 99
bored tunnel replacement will also include the latest technology in
ventilation and fire protection systems. Smoke, fire, heat and exhaust gas
monitoring systems coupled with video cameras will allow continuous
detection of hazardous conditions in the tunnel and allow for rapid
response of both sprinkler systems and emergency fan systems.
addition to these features, we are developing emergency response plans
that will be incorporated into the tunnel's design and operation as
More information about how the tunnel will be designed
to withstand other emergencies and natural disasters, including the event
of a tsunami or flooding, can be found on