The bird might be a Sandhill Crane. It kind of looked like this one, except I don't remember seeing a red crown and the wing tips were darker than the body. Also, apparently they aren't commonly found near water.
It looked more like the Great Blue Heron, a common Texas shoreline wading bird that occasionally moves to inland ponds and streams in the Winter. The breeding season plumage definitely wasn't there, but maybe it isn't Great Blue Heron breeding season right now.
I need to see it one more time.