I can't speak specifically about the Fort, because I won't be there until next month, but I can tell you it's been sooooooo dry here, that I haven't seen a mosquito in ages (even though we live near a lake). If we start getting regular rains again, all bets are off, but if it stays dry, they shouldn't be too much of a problem.
I like to buy those individually packaged Off towelettes to carry with me, so I can just apply as needed instead of having to be coated in repellant all the time.