The tree well thing in Colorado is weird. We don't have the Evegreens with big thick branchs that run way down to the base like in the PNW. Those types of trees really creat a hollow spot and with a deep snowpack a very dangerous trap.
Yet a few years ago I came across a stat on tree well deaths in the last 20 years or something and Colorado had the most.
There was one in Steamboat a few years ago. So it does happen but not very often. Tree well deaths also don't happen very often overall. The only thing I can think of as to why Colorado had more deaths is because we have more skier days than anywhere else in the nation by a long shot.
The tree wells in the west coast mountains are certainly more dangerous and require a healthy amount of respect.
Actually that was Nitro and it is fairly steep with a huge convexity on top. I took a few photos of the slide after it had happened. We were in first creek and saw all the emergency vehicles headed up. Glad it was a close call. That could have easily of been a killer. Lots of stuff to get banged into.
There is a reason why I do not play on that cliff line very often. I consider it one of the most dangerous places on the pass.