So most of you know the Allegheny river is in my front yard. I monitor the area in front of my place, but I also travel up and down. I'm by lock 3 but will go as far as 7 on the top to Pittsburgh where it merges with the Mon to form the Ohio river. We had temps that didn't get above 0 for a day or two then below freezing for a couple days. Sheets of ice form across the river 8 inches thick. It has to go somewhere. Lots of pics. No marinas were safe.