Insect and Spider Identification: CLOSED: Tiny flies swarming at Lake Huron (Michigan Great Lakes), 1 by icarusdive

icarusdive wrote:
These flies that look a bit like tiny dragonflies were swarming by the millions (no exaggeration) on the coast of Lake Huron over Memorial Day weekend. They were very small and *absolutely everywhere.* Walking through any short grasses would disturb thousands of them into the air. In places, they were swarming together in massive clouds that created a fairly loud humming noise. Every spiderweb was covered with hundreds of them. I'm wondering what they were. The image I'm attaching is a bit deceptive -- they were very small, perhaps only a centimeter long.

Help is appreciated!