It should be mentioned that Malibu Canyon is a very popular route for bikers out for a weekend-ride.
There is a place called the Rock Store on Mulholland Highway, not far from where this Jane Doe was found.
The Rock Store is a popular location where bikers park and show off their bikes and socialize.
The original police bulletin poster on NAMUS states "The body was found approximately 150 feet below a turnout on Topanga Canyon Boulevard approximately three miles north of Pacific Coast Highway."
There's a turnout, at what GoogleMaps labels as 1990 S Topanga Canyon Blvd, which is 2.8 miles north of PCH. Of course, I don't know for sure if this is *THE* turnout, but assuming it's close, the Rock Store (at 30358 Mullholland Hwy) is 20.5 miles away.
I used to live about a mile from this turnout, so I know the area. Topanga Canyon is still a popular biker route, and I'm sure they do come through on the way to the Rock Store. I just don't know if I would consider it "close." (Sorry, I'm not trying to be pedantic. Sometimes my Aspie tendency makes me obsessed with details.)
More Topanga Canyon info, for those who aren't familiar:
Right now, if one goes northbound on TCB from PCH, it's pretty much just wilderness (with a heavily-traveled, curvy, two-lane road) until you reach the unincorporated town of Topanga in about 3.7 miles.
It should be noted that there used to be a decades-old community called "Lower Topanga" (of questionable legality land-wise, from what I understand, MOO) that was located close to where TCB meets PCH. Its residents began to be evicted in 2002, so that the state parks department could restore the area to a more natural state.
http://articles.latimes.com/2002/mar/03/local/me-topanga3
This Lower Topanga area was mostly full of surfers/artists in the 1960s, but I don't know what kind of place it was in 1980. (Perhaps it had an outlaw vibe, as Topanga had in the 1960s? Pure speculation on my part.)
https://en.wikipedia.org/wiki/Topanga,_California#Culture
So the dumpsite was close (0.7 or so miles) to the town of Topanga on one side, and sort of close (3 miles) to Lower Topanga on the other.
It does make me wonder if it was someone just passing through who dumped the UID, or if it was someone local to the immediate area. The police bulletin on NAMUS is dated May 7, 1980 (nearly two months after the UID was located on March 9,) which makes me concerned that LE might not have done a lot of canvasing of the area at first. I don't know if the case was handled by LAPD or by the county sheriff. (Topanga is only served by the sheriff these days.)