Update from Tom Nagel!
The US Army Corps of Engineers has re-instituted its no slope flying rule at Alum Creek Dam.
Apparently the original no-fly rule was never rescinded, just not enforced, and the Westerville Model Aviation Club, whose field is at the base of the dam, had worked out a system to coordinate both sloping and flat field power flying.
Some non-flying officious intermeddler (that is an official legal term) raised the issue, and now the Westerville Club has voted to not allow any slope flying rather than risk losing their field.
Please remove my original posting from the slope flyer web site, and replace it with this information. Don and I will keep you posted if things change again.