I'm here right now. About to give up. I've been here for an hour and a half and haven't seen either bird. I walked both up and down the creek. The habitat on the other side of Broadway seems very favorable with berry and juniper trees. Lots of Robins, Waxwings, Starlings and a couple Solitaires in a constant feast.
I followed the steam through the neighborhood back to a cemetery. There's not much visibility or access until the cemetery but the habitat looks good along the whole length.
Lots of places for the Thrush to hang out and eat if it wants, but no luck for me.