That spot (right near the T intersection of Riverside and Green Bridge Road) is commonly used by bank fishers, but access for putting in any watercraft is rough, to say the least. I've parked there after dropping my canoe right at the little chain fence that marks the end of Riversides property, then dragged the canoe throught the poison ivy to put in on the softer gravel bank on Riverside's property a few years back, but the bank-side brush has grown quite a bit since then, and the gravel bank isn't the same, either.
It would be nice to have access right there, but it just isn't happening, and it only takes a little time to paddle up from the park anyway.