Width estimated. We spotted this slide from the power lines. First photo shows the debris well. Second photo sort of shows a piece of the crown well. I would estimate it at 4 feet deep and wind loaded. The weak layer we found was about 2 feet deep. With wind load, 4 feet seems reasonable at the crown. We couldn't seen any rocks in the bed surface, so I think it did break in the middle of the snowpack.
See snow profile and a few photos of the snowpack layers in this observation.