Well, um, yesterday actually.
But I'd like to go up again. The Coldwater Canyon area in particular looks worthy of further exploration.
The road (3N06) is in decent shape until you get to the creek crossing that HikeUp mentions. The crossing itself is a little sketchy in a passenger car, but with care and picking a good line, my Accord made it. From the crossing to the "trailhead" (the locked gate that prevents further progress by the public) is definitely sketchy for a passenger car. I had to get out of the car and "rearrange the road". I scraped my sides a couple of times on brush trying to maneuver around rocks. Doable, but not recommended.
Lotsa hunters around the flats, but only two hikers on the road to the notch. The hike itself is nice, but nothing to write home about. Middle Fork is a lot more scenic. The section through one of the branches of Coldwater Canyon is actually kind of nice (for a road walk).
Nice views of what I
think is Telegraph Peak.
Most interesting was this:

That's an LA County Sheriff's vehicle. Now of course the Lytle Creek area is entirely in
San Bernardino County. So what's an
LA sheriff doing there? Dunno. And of course it's USFS jurisdiction, not really county. Kinda weird.
Road's in good shape though.
HJ