Update 7/30/17: This is a horsefly. Also called a deer fly, breeze fly, march fly, or, most creatively, a green eyed fly.

What is this thing?

The eyes remind me of a fly but the other characteristics make me think this is some kind of bee?

He was sitting on the ground, seemingly crippled. At one point he stumbled into the lake. After fishing him out, I was able to take a bunch of closeup photos.