Regarding the Pinnacles Monument isn’t there an abandoned east entrance station to Crater National Park out there? I could swear I saw someone recently post about that on a social media platform.
Yes, there is.
It's a short walk from the Pinnacles parking lot. I believe you can continue walking down the old road several miles until it becomes a drivable road again. I'm told the Crater Lake National Park sign that hung from it lasted quite awhile, but it was gone by the first time I'd visited it.
For fun, here's what that old OR 232/US 97 junction looks like now:
The road ahead is the original OR 232. Here's a close-up of the signage:
What's interesting is that when US 97 was re-routed further east, the OR 232 designation was removed from the Pinnacles Hwy straight ahead, and transferred onto 97's old alignment (the cross road in the pic) when that became the Sun Pass Highway. It lasted on that new alignment at least into the 1960's.
CA 139 intrigued me since that became a state highway after the Forest Service built a modernized road through Modoc National Forest and transferred to the DOH. CA 139 obviously is taking its number from OR 39 and couldn’t fully match it due to CA 39 already existing. I always kind of found it curious OR 39 didn’t stay aligned through Malin and a new designation of OR 139 was assigned to ORH 426.
That would've made a lot of sense. But ODOT likely only thought to keep OR 39 on what ends up being the main through route.
That remaining part of ORH 50 wasn't given a route designation back in 2002-3, one of only a few of the previously-unsigned highways in Oregon that weren't.