It was just the frame, and a few deck timbers: https://c4.staticflickr.com/8/7478/15967080150_47ec573ed9_c.jpg
Apparently the mistake was to attach it here to the redwood: https://c4.staticflickr.com/8/7515/16128603346_f83135617f_c.jpg
These two smaller redwoods apparently bowed to the sides: https://c4.staticflickr.com/8/7541/15967079880_5727bc211f_c.jpg
We had only the far end attached to the steel cable: https://c1.staticflickr.com/9/8658/15534653603_ff9ac90178_c.jpg
So, we think the mistake was to trust the redwoods and not attach the close end to the overhead steel cable, and also that we had attached the far ends to the cable temporarily with just rope, which broke when the redwoods splayed out in the winds.
What we think happened was: 1. The redwoods splayed outward, pulling the boards out. 2. The close end fell downward putting pressure on the far end. 3. The rope on the right side of the far end broke under stress tumbling the boards to the steep hillside below: https://c4.staticflickr.com/8/7478/15967080150_47ec573ed9_c.jpg
We still can't get the dog out onto the bridge yet, though: https://c4.staticflickr.com/8/7536/15968633967_b05aedd4e3_b.jpg