Can't go over the landslide, but past it
You have to push a bit through the spruces, either right by the snow or cca 10m higher. Altogether it's about 100 meters, then you're back on the path. It's already slightly trodden past the landslide, so no panic.
There's quite a lot of water and to the waterfall you need to wade through water. Even to the last, biggest one not possible, because the entire canyon bottom is under water
WARNING: Don't walk on snow over the landslide, because it's hollow inside. The river has carved tunnels through it, so by walking over you risk it collapsing and falling a few meters deep.