Since fall 2021, York Region contractors have been rehabilitating a 1.5-kilometre section of the York Durham Sewage System that extends under

• 16th Avenue (Regional Road 73) between west of Williamson Road to west of Mingay Avenue

in the City of Markham.

The project includes:

• installing a temporary sewage bypass pipe;
• rehabilitating two access shafts;
• relining the trunk sewer; and
• other work.

Starting 9 p.m. Friday, July 5, the Region and City are closing

• Markham Road (Regional Highway 48), north- and southbound lanes, at 16th Avenue

to accommodate the next phase of the project.

The Region is also restricting traffic lanes on:

• 16th Avenue, east and west of Markham Road / Main Street North; and
• Main Street North, south of 16th Avenue.

The TTC is detouring buses along this route, while the street is closed:

• 102 Markham Rd.

Closing this part of Markham Road to traffic likely requires GO Transit to detour buses along these routes:

• 70 Uxbridge / Stouffville / Markham; and
• 71 Uxbridge / Stouffville / Toronto.

However, GO has not announced detour-routing information.

Also, York Region Transit passengers aboard buses along this route can expect delays near Markham Road / Main Street North:

• 16 16th Avenue.

This phase of construction on Markham Road and 16th Avenue and the resulting GO, TTC and YRT service changes continue until July 8 (5 a.m.).