If the pothole is on a City of Thunder Bay street, report it online or give us call at 625-2195. The time to repair can vary but if it's on a busy street, we will repair it as quick as we can. High-traffic roads often have more potholes than other roads due to the weight and volume of traffic.

Report A Pothole

Pothole repair

With normal winter weather changes in Northwestern Ontario, conditions are perfect for potholes to form in spring. Our Roads Division takes a number of steps to quickly repair of potholes. Roads today are being built to reduce their moisture capacity. Researchers are developing a better, more durable pavement. Cold patch asphalt is also being improved to last longer.

In cold weather

We make winter repairs using a modified cold patch asphalt. The modified cold patch can remove any that's in a pothole. This can speed up the repair process.

In warmer weather

We use hot asphalt and compaction rollers to seal up shallow potholes and cracks in road pavement. This helps to stop potholes from forming in the spring.

Why do potholes form?

  • Moisture seeps into the pavement and sub-base, freezes, expands, and then thaws.
  • The freeze and thaw cycle weakens the pavement.
  • Traffic loosens the pavement even more.
  • Pavement crumbles and pops out.



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