Walking across the bridge from the overflow parking to the top of Snoqualmie Falls, I looked down the river to the top of the falls just beyond the barriers to stop errant boaters getting too close. I also noticed something in the water below us. For a while I was trying to work out what it was. Then, courtesy of polarizing glasses, I could see through the reflections and make out the shape of some structure.
It looks to me like this was a previous bridge. It sits just below the current bridge alignment and looks like it would have been the right size and shape to be a bridge span. I wonder whether it collapsed or whether, when the replacement bridge was being built, it was simpler to dump the old span into the river than to take it away. There could be another explanation of course and maybe it isn’t even part of a bridge. However, it clearly is something man-made sitting on the bed of the river.