No help above, but below Lake Georgetown has been all out of sorts due to water releases. San Gabriel Park is one of my regular fishing spots and I haven't even seen fish there the last two times I've been.
When it settles back down and the fish move in, the park is good both up and downstream for wading.
I'm sure he'll check in, but I believe Charliebrown on here has kayaked from the park to Granger Lake.