Sorry for the late response guys:
Fishguz-Hey Tad, too bad you couldn't make it. We'll have to try it again sometime soon.
Bine-I believe the flow in this area is controlled from the Benbrook Lake dam. I have no idea how they determine to increase or decrease the flow. I know parts of the river were dry recently due to bridge construction.
Cowtown Kid-That's it. I park under the bridge at the Trinity River Trails trailhead on the north side of the river. I cart my kayak to a concrete drainage ditch about 50 yards from the parking lot. If you launch from most areas along the bank you're going to sink knee deep in mud. The drainage area is nice and rocky.
Pic of my launch area