Is it possible to tell what kind of willow this is? Is it really a shrub, or is it a young tree? I know, I could have done a better job of noticing the trunk.
The somewhat curved catkins and slightly weeping growth suggest it may be Salix caprea 'Pendula'. If you have another look at it you would possibly be able to see the graft between trunk and crown if it is 'Pendula. Salix chaenomeloides has probably the largest catkins of the willows but without a real sense of scale it would be rather difficult to tell Salix chaenomeloides from Salix caprea in a photo taken at distance.
Branching habit and length of catkins relative to thickness wrong for the first suggestion. Also the male weeping pussy willow is 'Kilmarnock', not 'Pendula'. Together the male 'Kilmarnock' and female 'Weeping Sally' combine to make up Salix caprea f. pendula.
Has the general aspect of that one. Will grow much too large for space unless pruned hard every year, right after bloom. And will still not stay anywhere near as small as it is now. If you ever have occasion to speak to the owner you might mention this while there is still time to dig it up some winter and put it where it has enough room. The other one seen around here with jumbo catkins is Hooker willow but that has the reverse orientation, with the branches and catkins curving out and then up instead of arching over. During the summer is it easily identified by its broad, dark green leaves with silvery undersides. The much less dramatic inland (Puget Sound etc.) version has been separated as Piper willow in the past, the ones seen having been planted previously for ornament are pretty all the outer coastal phase (or species). More recently either might be encountered in the revegetation and native garden plantings that have become prevalent. The clump of more than one sex of Hooker willow that has been across the street and down from me for many years has been out for some time this year and is probably starting to look past it. But any examples within your range of travel up there might still be looking good. I do not know if either of the two Vancouver tree guides gives locations for this tree.
I don't have anything giving the locations, but I see photos of flickr from Colony Farm Regional Park, Coquitlam (not a place I get to) and Burnaby Lake Park. If it's right at the lake and still blooming in two weeks, I might get to see it. I see an environmental group planted some exactly a year ago in Renfrew Ravine Park.
Any genuinely wild ones at those sites would be Piper willows. This is one of those areas where subsuming the less distinctive former species (Piper willow) into the more noticeable umbrella species (Hooker willow) does not allow for the different general appearances and ecologies (presumed from different distributions) of the two sets.
