Doug, I think the first step is, of course, the soil quality. Next consideration would be how much water the creek gets when 'seasonal' occurs. Talk to neighbors but also look at trees, etc. around the stream for flood debris. That should tell you something about the amount of water to expect. Using a well to fill a water hole is dependent on the size of the hole and how much well water you can pump. Windmills look good in the Mother Earth News magazine but are seldom dependable as either an aeration power source or as a high output water source. I think the first step would be the neighbors; then local dirt movers and well drillers. Oh, yeah, another consideration is the amount of silt and debris that the stream carries. Most beaver dams on creeks, at least in Texas, are notorious about silting up for awhile before they wash out.