I'll let you know, Curt! But it will not be for a long while -- it is a 16 hours or so drive for me! Depending on the weather, I might try to get there in December or perhaps next Spring.
But it is one of those places that just standing there is a moving experience...the heat, sounds of insects and blowing grasses, the surrounding lava cliffs in the distance, acres of sky above, no one around. If the map shows up below, I parked at the end of the dirt road next to Dry Falls Lake, then hiked over Umatilla Rock (the long formation running SW to NE) at the saddle, then over to Green Lake -- returning to Dry Fall lake around Umatilla Rock's NE end.
The map did not show up, but one can click on the link. Lots still to check out -- heard of some potholes, like one sees carved into the riverbed by rocks rolling around in a hole, but on a much bigger scale.