Alder, not larch. The buds are breaking into leaves not needles, and the "cones" are catkins. You may find old cones from last year as well, they tend to hang on to them so you get this year's and last year's at the same time. The bark is also deeply fissured rather than flaky in layers like most conifers tend to have. Couldn't say the species.
The bark is what is throwing me for a loop. The young branches look like Alnus incana (Gray Alder) but then when I see the older trunk, that throw that tree out of the mix. The gray and deep furrows with catkins. Hmmm...
Can you describe to me the site?
There is a chance it's a hybrid. Alnus genus likes to hybridize.
To be honest I'm thinking some type of willow. The trunk looks almost cottonwood, which would rule out alder or birch for me. Plus the calkins don't look like the small cones of alder. But I'm not overly familiar with Canadian trees. Alder cones generally come in bunches and look like this image below.