I've gone on a few hunts wearing muck boots. They've been surprisingly good in terms of ankle support, assuming they're the prefect fit for your feet. I don't know if I'd go on a 10 mile hike in them in the Rockies, but for the most part they've been pretty good. They're 100% waterproof and go up to just beneath my knees. They're absolutely awesome for crossing creeks like you mention.
They don't breath much though, so take that into account.
