Spokane St. Viaduct project: Latest updates

May 13, 2009 4:41 pm
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 |   Spokane St. Viaduct project | Transportation

From the city e-mail list updating what’s up with the Spokane Street Viaduct Widening Project work beneath and alongside the easternmost stretch of the West Seattle Bridge – several updates, including the latest on that “temporary closure” near 6th/Spokane on the surface; read on:

There is currently a temporary closure between Airport Way South and 6th
Avenue South on South Spokane Street. It is needed to allow placement of a
water quality vault underneath the Spokane Street Viaduct just west of Sixth
Avenue South, and will be in place for approximately 8 weeks.

This closure of westbound traffic between Airport Way South and Sixth Avenue
South will not affect vehicles approaching South Spokane Street from
northbound I-5 (via exit 163) or from Beacon Hill (via S Columbian Way).

Westbound traffic on Spokane Street will, however, take a slight jog to the
left as they proceed through the intersection. Westbound traffic will also
have the option of turning left to proceed south on Sixth Avenue South.

This left-hand turn onto Sixth is possible because there is at present no
eastbound traffic on Spokane at this intersection. Until Metro bus traffic
returns to eastbound Spokane between the E-3 Busway and 6th Avenue South –
now planned for near the end of July – this left-hand turn onto Sixth Avenue
will be allowed.

South Spokane Street between First and Fourth Avenues will remain closed to
eastbound traffic nearly until the new 4th Avenue Off-ramp to is opened late
in 2010.

4th Avenue Off-Ramp Construction Progress

Shaft construction has been proceeding rapidly, with the last of these
massive underground structures west of Fourth Avenue now finished and just
those in the City Light Parking lot left to drill and pour. Construction of
the columns on top of these shafts is also going well, with work on the
superstructure that will support the roadway to follow this summer.

South Spokane Viaduct Widening Progress

Plans and specifications for the widening work will be advertised for
construction the week of May 11, with bids due late in June. Mobilization
for construction is planned for September of this year, with demolition of
the existing 4th Avenue (west-bound) off-ramp likely to follow soon after.

In the meantime, subsurface investigation continues on the north side of the
existing viaduct for location of underground utilities. This work will
occasionally require the closure of traffic lanes on westbound Spokane
Street for short periods.

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