Don't forget the easy street crappie house in Jonestown.
It's not a pier, but it makes for a good family outing....at least it did last time I was there.
Depending on your point of origin, it may be closer than Granger from Austin. At Jonestown park, you can take the kids and if they get bored, you can BBQ, fly a kite, or just hang out.
Unless of course, you really want to take YOU fishing.
Where do they go when they're not there???