I think it is most likely a midge. It was too early in the year for mosquitoes. I've added a second photo. I'll need to carry my pocket ruler for scale!
I should add that they very strongly suggest mosquito in body shape and size, but that is a very good guess based on a single photo.
Midges often form a significant food base for terrestrial and aquatic ecosystems so are very important to the environment. When living in southern Wisconsin during the midge hatch on a nearby lake, I'd have to vacuum, literally vacuum, the hundreds that would invade our home each time the door was opened. Wasn't hard, just turn on a light in a corner at night and they'd gather at the junction of the corner and ceiling. It was a hassle though....
I'd suggest that this is one of the midges (Chironomidae), These little guys are really tough to ID down to a species level, so this may be as good as it gets. See http://bugguide.net/node/view/252910/bgpage for one example that looks really close to your photo subject, but back up to this page to start the search: http://bugguide.net/node/view/3163/bgpage
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