Gene from Indiana on 4/22/2012 10:55:13 PM:
I wouldn't worry about reservations. It is a big area and north of the National Guard Armory. Exit at the Katy West Trail head, turn left on the road for a few hundred yards+/-, then enter the campground. If you set your tent at the lower part of the hill, the restrooms are the red and white buildings through the gate. Someone will collect $10 for camping.