Here’s another map I picked up somewhere. It shows all flowing water in the western United States.
The detail is extraordinary:
You can download a bigger version here.
If you look closely, you can find where I live: find the Grand Canyon, then go north to the next major river (the Virgin), then look for the first large white space above that. Cedar City is towards the southern end of that white area, along one of the creeks flowing west out of the mountains.