I was talking to a friend last weekend about how different the Mississippi River Gorge would be if the Ford Dam was removed, returning the water levels to something closer to their natural levels. As I understand it, this would unveil long submerged islands and rapids.
One side effect of the I-35W bridge collapse will be a lowering of the water levels downstream from the falls, which should lead to a lowering throughout the gorge:
Later this afternoon, the US Army Corps of Engineers is going to lower the water level of the river by two feet in the area of the bridge collapse.
After the initial investigation is done, the Corps will open the roller gates at the Ford dam (i.e. Lock&Dam #1), dropping the level of the pool and giving emergency workers and investigators better access to the wreckage.
I’m curious to see what that’s going to unveil.