I went here on a Saturday in November. I am from Maine, so I was thrilled to be able to swim outside in November somewhere. I got in on the far end and did a lap down to the other and went back and forth a few times. The pool is long--over 100 yds, and over 25 yds across. The sides have ladders and stairs to get it, but the bottom is totally just the river bed. You can see rocks and vegetation as you swim along. They also have a diving board section, and had lifeguards on duty. Since I went in the off season, it was free to enter. It was a bit cold (air), but the water temperature remains stable there. What a cool gem right in the city! I recommend visiting!