Failing railroad bridge

The Exeter to Duryea (?) D&L bridge as of yesterday...

The same bridge in a picture taken during last year's RiverFest paddle...

It seems to a lose a foundation stone or two every year, but it's obvious the '11 flooding wreaked some havoc on it.

And when it collapses (sooner rather than later), who's responsibility is it to remove it from the river bed?

Later