I've been trying to find a place where we used to go swimming out near Cristoval, Texas, which is between San Angelo and Eldorado. Looking through Google maps, it looks like Pugh Park.

https://www.christovaltx.com/river.htm

Except that the park is east of the highway. I remember exiting west. And, it doesn't look like I remember with a small weir. My father would take us there in the summer. I had a good drowning after swinging from a rope despite barely knowing how to swim.