For those interested in hunting Trinity River NWR - McGuire in the future, I thought I would provide a little update.
Map Update: Attached is a slightly updated map. The area highlighted RED has super thick brush and few decent shooting lanes. The area highlighted in BLUE is still pretty thick in brush in most areas but you can find yourself some decent shooting lanes.
Brush Rating (1 - 10 scale): 9 (Heavy Brush)
Shooting Lane Rating Average (1 - 10 scale): 2 (Mostly short shooting lanes)
Shooting Lane Rating Best (1 - 10 scale): 5 (Best areas I found had decent shooting lanes)
Observations: The biggest problem with this hunting area is the surrounding properties are heavily hunted. Along the southern perimeter alone (and I didn't walk the entire southern perimeter) I identified seven stands against the fence line with feeders sitting approximately 100 yards in (so at least they are shooting away from the NWR instead of towards it). If you can get out during archery season you probably have a decent shot at getting a whitetail. Once general season opens up though, you can count on the surrounding properties luring all the NWR whitetail over to their feeders and thinning out the herd substantially. Mud boots REQUIRED, this place is wet and muddy.
Whitetail Herd Health/Population: POOR
Whitetail Overall Hunting Difficulty: HIGH
Best Feature: Every day but one that I hunted, I was out there alone (no one in parking lot when I got there, no one in parking lot when I left, and I never saw another hunter on the NWR). The ONE day where there was someone else on the NWR, it was a GW running the trails on an ATV - which was pretty annoying, but I otherwise never saw another soul on the NWR.
Squirrel: Crazy heavy population of squirrel - you could easily limit out daily in an hour or two. The little suckers were everywhere, had a few run up close to me and stare at me for awhile.
Wild Hog: Insane population of hogs - If you want wild hog, you can easily find them here. Your biggest issue will be the heavy brush/limited decent shooting lanes. I'd say that if you wanted wild hog, you could 100% get them here.
Final Thoughts: Overall, I had a lot of fun on this NWR. It's not an ideal place to hunt whitetail by any means, but I don't mind a difficult hunt. I'll probably put in for it again next year with the intention to go hunt hogs and if I happen to get a whitetail while I'm there, then bonus.