A report on the health of Ottawa's metal storm sewers and culverts found most in good shape but identified two culverts under Highway 174 that should be fixed as soon as possible.

The report comes after a more than three-metre-wide storm sewer pipe collapsed last month under the eastbound lanes of Highway 174 near the Jeanne d'Arc exit, causing a sinkhole that snarled traffic on the highway for tens of thousands of commuters.

The report looked at about four kilometres of storm sewer pipes under major city roads and found about half of that pipe had already been relined in the last decade.

The rest is either scheduled for relining soon or in good enough shape that engineers aren't concerned about it right now.

There are also more than 300 metal culverts. City engineers zeroed in on about 45 in critical locations, including Highway 174, the 417, the Transitway and major arterial roads.

They rated 17 in "fair to poor condition," and said they need to be relined within the next decade.

The two metal culverts under Highway 174 — one west of Montreal Road, the other west of Orleans Boulevard — are in need of what staff call "accelerated relining." In other words, work that needs to be done as soon as possible.

The report also noted the metal pipe under the westbound lanes of Highway 174 at Jeanne d'Arc, was made of a different material - galvanized steel - than the pipe which collapsed, and noted that it aged much better.

Another report in December will look into the root causes of the failure that caused the sinkhole.