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Yonge North subway extension:
Geotechnical surveying continues, February 25



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Two transit agencies and two municipalities are starting the preliminary planning, design and engineering phase of a project to extend the Yonge branch of the TTC’s Line 1 Yonge - University subway into York Region.

Yonge subway extension map.jpgMetrolinx, the TTC, the City of Toronto and the Region of York are planning to extend the line 7.4 kilometres (4.6 miles) through the Thornhill area of Markham and Vaughan to Richmond Hill. The four partners expect this phase of the project to continue for about a year.


With the preliminary planning, design and engineering phase underway, crews continue geotechnical testing

  • on Yonge Street between Highway 7 and Finch Avenue.

The crews work at various locations on Yonge over the next several months.

Geotechnical surveyors investigate underground soil conditions to help engineers design the project.


Starting 7 a.m. Monday, February 25 and continuing Mondays to Fridays, crews work in the northbound curb lane

  • on Yonge Street south of Royal Orchard Boulevard and
  • on Yonge Street north of Clark Avenue East.

The crews use a drill rig to bore holes and extract samples. The work zone blocks the northbound curb lane through the area during off-peak hours. At the end of each of work day, crews remove the work zone and restore the roadway.


Expect construction-related noise and dust from equipment and trucks.

GO Transit passengers aboard buses along this route can expect delays:

  • 32 Brampton / Trinity Common / North York.

York Region Transit passengers aboard buses along these routes can expect delays:

  • Viva blue;
  • Viva blue “A”;
  • Viva pink;
  • 3 Thornhill;
  • 77 / 77A Highway 7; and
  • 99 Yonge.

Geotechnical surveying on Yonge south of Royal Orchard and north of Clark East and the resulting GO and YRT delays continue “for approximately two weeks” or until about March 8.

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