Grindstone Creek bridge repair update
The major construction project remains on schedule, with much of the current work happening below street level.
The Grindstone Bridge reconstruction project on Dundas St. is progressing well and remains on schedule. The one-way, alternating traffic flow on the single lane of remaining bridge is anticipated to continue until fall 2026, as per the original timeline.
Much of the work to date has taken place under the bridge. Last fall, repair and reinforcement work took place on the single lane of the north side of the bridge, which was needed for safe and continuous traffic flow throughout the project duration. Once completed, utility bypass work was finalized, and demolition began on the two south lanes.
Photos show early preparation work, including the buttressing of the original north side of the bridge that remains in use, the relocation of the sanitary bypass pipe, removal of the existing sanitary sewer under bridge, placing track protection, and south side demolition. Note that the track protection timbers had to be removed and then put back in place every time a train had to pass through.
Once the south side was demolished, the preparation work for the new bridge began. Shown here is the installation of the new liners, as well as the pre-auguring and pile driving of the new foundation supports.
As of May 2026, the corrugated steel pipes were installed, piles were strengthened, and rebar has been installed. As previously mentioned, virtually all bridge work completed to date has taken place below street level. Phase 1 of the project remains on schedule and will be completed by fall 2026.
In fall 2026, two-way traffic will return, using two lanes on the newly constructed north side of the bridge. Further, pedestrians will have sidewalk across the bridge. During Phase 2, the single north lane will be demolished and rebuilt, Once completed, the new bridge will also include improved sidewalks and a multiuse path.
See artist's rendering below:
Further information, images, and updates can be found on the project website.
