I was recently driving on 299 after a sort of “day killer”, meaning I had to go way out somewhere to work for 2 hours and found my self at 1 PM with nothing to do. Then I passed by Grays Falls and remembered a fellow blogger had recently mentioned that spot (Thanks Ross!). So I doubled back and walked down to the falls.
More like rapids than a true waterfall, but a neat spot just the same. The steep cliffs on either side of the Trinity are really impressive. The trail is a easy enough walk, although it is a little slippery in spots. It was raining lightly when I was there, and think the river was up from melting snow in the highlands. You can also take a short trail down to the banks of the river, which goes though a pretty Douglas-fir forests. If you want to go there, just look for the sign on the 299 near Burnt Ranch.