Don't wade in Sheldon lake it's loaded with gators, so I'd assume other ponds in the area have them too. Fishing with cut shad in Sheldon once when I caught a bowfin, cool fish, not cool trying to fight it away from a little 3ft gator.
When I go to Houston and I want to fish I hit the san jacinto river(kinda sketchy area, take a friend), lake Conroe, and lake Livingston. Conroe and Livingston are a drive but better fishing than any where I found "in Houston." Livingston state park is nice and it's where I do the best. I throw my cast net off the dock at the state park and catch shad and bluegill. Fish the cove south of the dock and out on the wind break levee in front of the dock. Good solid fish for bank fishing, blues from 5 to 15 lbs. This was in march so they were shallow at the time so you might try to cast to deeper water now that it's summer.