The $600-million upgrade, completed in 2010, was supposed to last at least 75 years, but two retaining walls along the route from Vancouver to Whistler, B.C., are already in need of repair.
"In my opinion, what happened at the time — 2006, 2007 — the walls were built in a hurry and there's bulging, the panels are open, there's some problems with drainage, which is a big deal," Pearson told The Early Edition's Rick Cluff.
Transportation Minister Todd Stone spoke in the legislature saying the walls are "absolutely safe," and Pearson said he has also been told by the Ministry of Transportation that the damage is only cosmetic.
"These are walls that aren't seen by the public because they drive over top of them and the face of these walls is down over the edge," he said.
"I think that if the public had to drive by the walls, if they were on the upper side of the highway, I don't think they would have passed."
Pearson said he didn't see any issues with the construction while it was being completed, and said crews were careful to ensure all materials used came with the necessary paperwork.
Pearson would like to see an engineering audit of the highway to ensure the road is safe.
To hear the full interview with Mike Pearson, listen to the audio labelled: Sea-to-Sky Highway needs repair.