Welcome! It's not barging at all

There are two pools at the Poly. The main pool (volcano pool) has some depths to 4' 6" (I'm approximating here based on what I remember seeing and how tall I am which is 5' 4" and I've never had to go on tip toes to keep my head above water but I am up to my shoulders). The East pool (some people call it the quiet pool) was recently made more shallow. It is not over 5'. Again, I'm using my own experience in the pool as a guide. It felt deeper than the volcano pool but not by much.
The volcano pool is the only pool with a lifeguard but they go off duty anywhere from 8 - 10 pm based on the season. The east pool has no lifeguards. I've swam in both pools late in the evening - they stay open even without lifeguards. I'm not sure about official closing times. We've swam in the east pool at 1 am but we were quiet and there were other people there. But I imagine you would get kicked out if you were loud that late at night.