Thank you to each of you.
Yes, Kindred, that is a long exposure. I took this photo probably five years ago, so I can't tell you exactly how long it was, but probably on the order of 2-3 seconds. I personally like the lace veil effect on running water, so most of the photos I take of water is a long exposure. I do, on occasion, use an extremely short shutter speed (1/8000 sec. or so) to freeze breaking waves or the splash of running water.
dwtim, IIRC, you live in the UP of Michigan. There are some beautiful waterfalls there as well. I'm quite certain you could get some nice photos of them, if that's your thing.