I had with me a Dragonfly Specialist, (complete with net and inspection jar), so we had a fun time pottering around identifying the various species. The valley is broad-bottomed and the river meanders this way and that, sometimes between rocky outcrops, sometimes through shaded groves of alder and poplar, sometimes with deep pools, sometimes rustling and rushing over loose rocks, sometimes disappearing altogether only to appear again 50 mts later.