Jill-of-all-Trades wrote in post #17605937
That looks to be about the size of a horsefly. Those suckers will take a chunk right out of you when they bite, and they are relentless! If one thinks you look tasty, you have to kill it or it will not leave you alone. They'll even hold on if you go underwater, or just wait for you to come back up.
Back in Illinois we too had horse flys but they were about 1/2 the size of this guy. You had house flys, then deer flies which bite pretty bad and about twice the size of a house fly. Then horse flies which we twice the size of a deer fly that also bit hard. This guy was twice again the size of an Illinois horse fly, easily well over an inch long, probably more like 1 1/2 long.