Capitol Lake is manmade and filling with sediment. The authorities involved are undecided how to resolve the problems, since any solution is expensive, including letting the lake revert to a tidal basin. In the meantime, large areas of algal scum develop every summer. I found this large patch directly under a walking bridge and thought the patterns were interesting.
Camera: Nikon AW300 Lens set at 6.1mm ISO 125 1/50 sec f/4.2