Upper Reservoir

Ameren has applied for permission to stabilize the breach in the upper reservoir. Since the public will never be allowed up there again I hope someone will provide some aerial photos of the work once it is completed. Here are some quotes from the letter that FERC sent to Ameren about the work.

Drainage design is necessary if the shaft is to be sealed. Your consultant should
ensure that grading in the reservoir bottom and the proposed drainage ditch are
adequately designed to handle runoff. Culverts should also be properly sized.

We recommend that you establish new permanent survey control monuments, in
areas that will not be impacted by the construction activities.

For safety reasons, we recommend that the membrane liner be removed from the
edges of the north and south ends of the breach back beyond the distance of the
slope layback before the slope layback begins.

The parapet walls in both the north and south directions away from the breach
beyond the distance of the slope layback should be removed before slope layback
can begin. The work schedule should be modified to start this work before
proceeding with the actual slope layback.

So it sounds like a lot of heavy construction and the shape of the breach will change a lot from the photos that were published in December.