I travelled that road last year. Reported on it here on BPL, I think.
I drove my 2002 Acura MDX, for reference.
The stream crossings were not the problem. The first (early on) was bumpy, but not terribly difficult so long as you picked the right line; looked worse than it was. That could change, year to year (it was slightly worse shape last year vs the year before). The second crossing has more water, but is much smoother.
The worst bit was a severely rutted section with a high rock in the road and a tree near the road that limited maneuverability. I had to make two attempts, scraped bottom, and was really worried about ending up on top of that rock with all four tires in mid-air. The return wasn't nearly as nerve-wracking, probably because I had sufficient momentum/speed going downhill that I didn't have time to worry about it.
There were a couple jeeps and pickups at the lake.
Maybe it was graded this year and it will be smooth sailing. Worst case, park and walk the rest of the way up?