Damselflies are the bane of my existence as a photographer — adorable, striking, expressive, and damn near impossible to identify in the field. They are either identified based on some tiny part which was just out of focus or just out of shot, or they start life as one color and turn other colors as they age.
This is probably (thank you, kind people at iNaturalist) a blue-ringed dancer, Argia sedula. At a guess, it’s an immature male, because the females are totally brown and “weakly marked” and an adult male is a vivid, neon blue like this.