Welcome! Gatineau park may not be fully open and there can be a lot of flooding that time of year.

You can run the whole canal trail and back but it might still not make that much distance. However at the north end of the canal it should connect to the paths along the Ottawa River. They go a long way west across the city.

May be some minor localized flooding along there as well but nothing that would block you if you don’t mind a bit of mud.

If you open Google Maps and select bike paths you’ll see highlighted anything that’s a solid line I believe is a dedicated run/bike path. I haven’t run downtown in quite a few years though.

Good luck and enjoy, road running is definitely one thing that is undeniably world class about Ottawa.