More accurately, this is half of Cayuga Falls. Since I'm usually shooting waterfalls under cloud cover or after the sun sets, I typically get a slightly cool white balance from the camera (slightly favoring blue). I can often get a good custom white balance by using the water itself. After selecting the custom white balance tool, I click on a near-blown white area in the image. I usually try to find a point that has one channel (R, G or B - usually B) that is just below 255 with the other channels having lower values. A CP filter was used for this shot.