Thanks to Johnny U for pointing out a spot that's been right under our noses for years. If you've got that hunter-gatherer urge and blackberries are your quarry, then this is for you.
The alley running E-W, between Edmunds and Ferdinand, 42nd and 39th — it's flanked by two solid rows of large, ripe blackberries. It's just the right mix of sunny, watered, overgrown, and public!
In less than an hour, the boys and I picked a couple gallons (net).