You can see where the structures and the highway were relative to the slide using the Seattle Times interactive map
http://seattletimes.com/flatpages/local ... slide.htmlMost of the people saved, and the bodies that have been recovered so far have been near the leading edge of the slide flow (seen in the picture above).
The deepest part of the slide is on the other side of the river from where the homes and highway were, so there likely aren't any (or very few) buried there.
That said, the recovery teams have already warned that some bodies may never be found, or at least not for a very long time.
Edit: And yes, this is an area that is prone to slides. I've personally never been to Oso, so I'm not sure how obvious the danger was to the people living there. I know that the slide covered a state highway (some of the people killed/missing were driving on that road). I'm guessing it wasn't readily apparent, or obvious to the average person.
I saw a TV interview today with a geologist who was hired by the State Department of Ecology to do a study on slide danger in this area, and the potential impact a slide would have on....
the fish in the river. His report was that the danger to the fish was extremely high. Sadly, apparently, it never occurred to the folks on the Department of Ecology that there were actual humans living there too.. so the report was stuffed in a drawer.....