Yeah, count me in as loving Austin no matter what decade you're talking about. It's why I love finding all these photos of the past. It's a part of Austin I didn't get to see, so naturally, I'm curious about it.
Anyway, yeah, that's East Avenue. I think the photo was likely taken from the bluff near the dog park on Riverside just about where the bridge is now.
That little cove in the river at the foot of East Avenue is still there.
https://www.google.com/maps/place/Au...!4d-97.7430608