Focus on the logs in the middle of the image. They are lodged across the river from bank to bank because that is where the ended up when there was that much water coming down this canyon. This is not unusual unless you have been around when all that water was coming down the river. Logs wedged in the rocks are also fairly common in the slot canyons of my own desert Southwest. It is impressive to see the size of the logs and imagine the force of the water that placed them there.