There's a Trinity River parking spot at White Settlement Road and Isbell Road (across the street from George's Foods). Here's a link:
http://maps.google.com/?ll=32.760645,-97.384057&spn=0.01218,0.026157&hnear=6200+Pershing+Ave,+Fort+Worth,+Texas+76116&t=m&z=16&vpsrc=6
My son and I have luck with different sized spinners. Regularly catch and release (do NOT eat Trinity River fish) spotted bass w/ the occasional largemouth. Others tell me they catch catfish here, but we haven't tried it yet. Not sure how the winter fishing is.
Also, check out the bankfishing map that's the first thread in this "bankfishing" forum. It has a couple more spots.