Hi, I used to live around the corner from Turnbull and always used it as part of my training loops. It's pretty quiet up there, but you will encounters some traffic, so be heads up for that. But the good thing about the traffic is that the road snakes so much, with many 10, 15 and 25 mph corners, that they never get going that fast to be a problem, this also gives you more time to deal with it. It's roughly 2 miles long from the Whittier side and probably the same from Hacienda Hts, depending on where you hit it.
For me, the best side to descend is into Whittier. It's a bit more fun IMO, it's a bit more twisty-turny and the corners are banked a better. It's probably never steeper then 5 or 6%, that is if I remember right, but it's grade is consistent with very few irregularities in the angle of the dangle.
One note: I wouldn't ride it at night as its a favorite place for local nefarious types to hang out, drink, spin their tires...or, like what happened to me one time, though not at night. I went out to do some laps on a loop I would do which incorporated Turnbull. Typically a lap would take me a little over an hour and a half or so. So on the way up it for the first time, it''s cool, normal, nothing out of the ordianary. I was passed by a few cars in both directions, but really no more then 3 or 4. So I come back around for the 2nd lap and I see the road is blocked off at the base of Turnbull on the Whittier side with Police Line tape. It seems that someone had found a body off the side of the road in-between the time I had passed and an hour or so later. Go figure.
But for the area it's probably the premier ride/climb you can do and is a favorite of area riders.
Another good combo to ride in near Turnbull is by riding up Avacado Terrace/Edgeridge, which goes up the canyon directly to the west of Turnbull, on the Hacienda Hgts. side. It ends at the top of Turnbull Cyn., but is more direct and much steeper. It's a very quiet, almost single lane road and has to ridden to be appreciated.
Last edited by bigdraft; 08-20-07 at 11:33 AM.