Dave--I haven't grown much at high altitudes; my time in Montana in the summers is spent writing and hiking, though I got some annual beds sown last year. So I can't make recommendations based on
experience, and I try to stick to stuff I know firsthand. A
pond in a dry climate needs a good water source, or it will just dry up. You need to ask what you want a pond for, and whether it is the highest use of
land, water, and materials, and whether it is likely to be successful and be the best way of doing what you want it to do.
Sepp Holzer's book is one of the best on high-altitude
permaculture. Jerome Osentowski at
http://crmpi.org has been doing mountain
permaculture longer than anyone else I know in the US; he's near Aspen and is a genius--his
greenhouse development is brilliant (greenhouses are near-essential, I think, in that climate--lots of bang for your buck). Sandy Cruz in Colorado is one of many others who really know a lot on the subject.
Since I go to Montana for reasons other than teaching, I'm not doing courses there currently. But there are great Pc scenes in Bozeman and Missoula, and probably elsewhere.