Upper Reservoir II

Here are three paragraphs from a letter that FERC sent to Ameren about the 70% design papers for the new Upper Reservoir. The next meeting to consider the 90% design is October 2.

At the next BOC meeting please place on the agenda a discussion on the
location of the emergency spillway, details on how the critical elevations were
selected, breach parameters and expected inundation areas and associated
structures, if any.

A prototype demonstration of the aggregate preparation and material blending will
be required to determine the feasibility of the RCC system design. The demonstration
should include a third crusher location to produce the fine sand aggregate. This should be
scheduled and it is not clear when this will be conducted.

The designer should consider redesigning the precast panels for the
emergency spillway. The current detail will admit water into the joints between the
horizontal cast in place concrete and the vertical precast panels. This will allow
freeze thaw jacking and the potential for extensive panel damage in the event of an
overflow. While this would not lead directly to a dam failure, it may require
extensive repair.

Maybe we will know by November 1 whether the Upper Reservoir is going to be rebuilt. Anyone want to start an office pool?