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Yonge North subway extension:
Geotechnical surveying continues, October 2



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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 Tuesday, October 2 and continuing Mondays to Fridays for about two weeks at each site, crews work on

  • Yonge Street, east curb lane, north of Clark Avenue East (four sites); and
  • Clark Avenue West, north curb lane, west of Yonge Street.

The crews use a drill rig to bore holes and extract samples.

The work zones block traffic lanes from 7 a.m. until 7 p.m. At the end of each of work day, crews remove the work zones and restore the roadway.

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

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

  • 32 Brampton / Trinity Common / North York.

2019 - 10-02 - Geotechnical surveying on Yonge north of Clark and Clark west of Yonge.jpg

York Region Transit passengers can expect delays aboard buses along various routes at each of the two sites.

  • Yonge north of Clark East:
  • Viva blue;
  • Viva blue “A”;
  • Viva pink;
  • 77 / 77A Highway 7;
  • 98E Yonge express;
  • 99 Yonge;
  • 300 Business express;
  • 301 Markham express;
  • 302 Unionville express;
  • 303 Bur Oak express; and
  • 304 Mount Joy express.
  • Clark West west of Yonge:
  • 5 Clark.

Geotechnical surveying on Yonge at various locations — and the resulting GO and YRT delays — continue until about December 11.

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