When are they replacing the Heth's Run bridge?

This was in today's news:

Highland Park drilling to affect Route 8 traffic
Geotechnical research and drilling on Route 8 near the Pittsburgh Zoo will intermittently close lanes in both directions on weekdays, starting today and continuing through early December, PennDOT said. The closures will happen from 9 a.m. to 3 p.m. and from 7 p.m. and 6 a.m. The work is preparation for replacing the bridge that carries Route 8 over Heth's Run. [The old spelling is Haight's Run]
From: http://www.pittsburghlive.com/x/pittsburghtrib/news/pittsburgh/s_764726.html

These are the plans that were floating around a few years ago. The bridge replacement is the first step in the master plan for linking the zoo to the Allegheny again. An Adobe Reader PDFs are attached. "District 11_Butler Street Bridge Heth's Run Bridge.pdf"

From: http://smart-transportation.com/case_studies.html (click on District 11)

To see the plan in context,

See: www.senatorferlo.com/images/pdf/heths_run.pdf

For more on the history of the bridge,
See: http://pghbridges.com/pittsburghE/0591-4482/heths_run.htm