So I wanted to post this about the short trip I took today, because there's relatively little info about this road aside from some motorcycle trip reports. The wife took the baby to one of those drink-and-buy-shit parties, so I took the time to finally try this road out. I had wanted to for a long time, but I never knew how long it would add to a trip, so I had always avoided it.
Now that I've driven it and timed it, I don't think it's any faster than taking 156 to Union in Hollister. But it wasn't nearly as slow as I thought it would be. From 101 to 25, it would have been about 25 minutes.
Now, the road is important in the larger scope because it is the only road crossing of the Gabilan Range for over 71 miles, between 101/156 and 198.
A couple of interesting points on La Gloria Road:
- Pinnacles National Park has a closed section just to the south of the road. On the drive, I found it somewhat obvious where this was, and it is possible (but not advisable or legal) to bushwhack over to it. That said, it could be a potential northern trailhead some day.
- Willow Creek Ranch on the north side of the road in San Benito County, now used by Wilderness Unlimited as a hunting area, is slated to become a national conservation area because its adjacency to the national park, water access and risk of development (read: new Gallo vineyard) means that it's a threatened area that could potentially impact the park.
So I had seen posts online that talked about La Gloria Road being a mix of paved and dirt. It's all dirt. Strangely, the most well-maintained section is the right in the middle, in the Williamson Valley (which is really a plateau), from the county line to near the national park boundary. The rest is a twisty, mostly 1.5-lane, often washboarded dirt road. Certainly not the worst thing I've ever been on, but I don't really know why motorcyclists would be interested in it except as a challenge. In fact, of the three vehicles I encountered on the drive, one was a motorcycle.
So, link to the pictures:
https://www.flickr.com/photos/38770231@N04/sets/72157671277026024And a couple of pictures of highlights:
There are three of these signs (though this is the only one where there's another sign translated into Spanish) before reaching the end of the pavement:

A milemarker on the San Benito side. I didn't know this before, but San Benito County
has numbers for all its roads. On the Monterey side, there were green half-mile markers.

Turn-off for La Gloria Road on SR 25 southbound. Note the wooden "LA GLORIA" sign attached to the sign for Gonzales. I didn't see any truck warnings on this side either.
