The photos below show the lock & dam during high water in the autumn season. Normally, autumn is a low water time of the year, but unusually rainy weather to the north has caused rivers to rise. In this case, the river is free flowing and has no drop at the dam. Normally, the downriver side of the dam would have a 10 foot drop.
There may be big changes coming to Lock & Dam #20 in the near future. First, the City Of Quincy has applied to install a hydro power generator at Lock & Dam #20. Second, the US Congress has passed a bill that would fund expansion of the locks starting at Lock & Dam #20 to be 1,200 feet long to accommodate the modern sized barge tows that today must be broken up and lock through in two pieces. This would reduce average lock time from 3 hours down to about 45 minutes.