Dragonflies at Wood Lake Nature Center

Wood Lake Nature Center is located in the heart of Richfield, MN, which is a southern suburb of Minneapolis. The lake itself is very shallow and has to be dredged in the past. These are pretty good conditions for dragonflies so I am always on the look out while I am there for some dragon pics.
Back in the middle of July I found a few dragons. The first one, pictured above, is a great face shot but the angle makes it difficult for me to ID it. Maybe if I had some more experience I would not have problems but this is only my second summer photographing dragons. I believe that it may be a juvenile female blue dasher but I am not 100% sure. The juvenile females are brown with yellow markings on the thorax and abdomen. As the male and female age their abdomen turns blue with pruinose.
This dragon is definitely a male twelve-spotted skimmer. We know that he is male because the pattern of the spots on the wings as well as the white spots, which the females do not have. He has probably been around for a while because his abdomen has turned blue with pruinosity.
This female widow skimmer also looks like she has been around a while, at least in dragonfly terms which is measured in days or possibly weeks. You can see the age in her wings. The male widow skimmer has white bands on the wings located just outside the black patches at the base.