Originally Posted by
Grumman
My guess:
1) Shipping- the upper needs to be maintained for the boat traffic coming out of the locks
2) Fossil beds at the museum- I've heard June 1 is the target date to get the upper closed ever year so all the kids, school groups, church groups.....etc that visit the museum have the chance to walk out on the fossil beds.
This year obviously there has been to much water.
3) Electric demand and need for water at the plant
4) I would venture to guess they open the upper to help keep debris away from the hydro plant when it gets up high
5) Is there ever any logic down there??