Most plausible failure mechanism to me is an extremely heavy, wet snow load that got lopsided as the upstream side melted, twisting the bridge until it buckled. Might have been aided by a strong wind coming downstream.
But I'd love to hear what the pros say when they get in there!
Mike Sherman
On 04/22/2023 10:11 PM Chris Armstrong <sacarmstrong@...> wrote:
Seems plausible some dynamic force is the cause but hard to imagine an avalanche was the culprit as there is no damage to even the smallest of trees in the photos.?
