A big portion of the Wichita Mountains are a US wildlife refuge, but the mountain bike trails are on the other side of the fence from the refuge and are just part of the lake which is maintained by the city of Lawton. I'm sure that any maintenance that gets done is probably by bike clubs in the area. But yeah, the ton of rain that we've had in Oklahoma has made things grow out of control at the moment.
BTW, I'm new to this thread, but I hope to add to it in the future. I've been out of mountain biking for a while mostly to being lazy, but I'm getting back into it. I found a pretty good deal on a Trek Top Fuel frame on ebay a couple of months back and built that up with parts off my old Stumpjumper. I'm still about 10 years back in mountain bike technology. Would be great to get a newer bike, but holy crap, bike prices are getting crazy.
I'm in Oklahoma City and will post pics from spots I hit around the state.