I just came through that area on my way home from Vancouver. Had to re-route and go through kelowna/crowsnest pass/lethbridge/etc.
From what I saw, it was really bad in sicamous and its expected to rain more over the next few days as well. However, you are able to drive on highway 1 from Kelowna to Sicamous and overlook the water and it seemed fine when I drove past. I think the problems lie more along highway 97A.
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