The already congested downtown core has become even more so with one of Toronto’s busiest intersections closed for construction.

On Monday, city crews started to dig up the intersection of Dundas Street West and Spadina Avenue to replace a watermain.

Two weeks later — from July 28 to Aug. 11 — the TTC will upgrade its switches and tracks as part of ongoing maintenance.

“What the TTC needs to do is pull out all of that track and [the] switches and rebuild the intersection with new track,” TTC spokesman Brad Ross said.

“The last time that was done was 1996.”

Service on both the 510 Spadina and 505 Dundas routes is affected as follows:

505 Dundas

  • July 14 to Aug. 11: The 505 Dundas streetcar will divert in both directions via McCaul Street, College Street and Bathurst Street.

510 Spadina

  • July 14-28: 510 Spadina buses will operate through the intersection, with one lane open in each direction.
  • July 28-Aug. 11: The intersection will be closed to all traffic. The 510 Spadina bus service will split into two parts. The north part will operate between Spadina Station and Baldwin Street. The south part will operate between Sullivan Street and Queens Quay. Customers travelling the length of the route must transfer buses by walking between Baldwin and Sullivan.
  • Aug. 11-30: On Spadina Avenue, one southbound lane and one northbound lane will reopen, allowing 510 Spadina buses to operate through the intersection.

At the same time, the TTC will be retrofitting the streetcar platform at Spadina Station to accommodate its new low-floor streetcars.

“We’re now in the countdown to a momentous occasion for the TTC, which is the introduction of our brand new streetcar fleet the first of which will deploy onto this route, the Spadina route, on August 31st of this year,” TTC CEO Andy Byford said.