Hot Creek Hatchery Road is a maintained dirt road.
If sherwin creek road is the one I'm thinking of, it too is a maintained dirt road.

Never used Cold springs laural pond road, but I'm betting it is a maintained dirt road.

Laural Lakes road can be a decent trail, depending on when it was last graded. A stock truck should be able to make it no problem. I saw a subaru back there once, but he had to be scraping the whole way through. It is a very nice, scenic drive though, and laural lakes are up at 10,000 feet which means they have golden trout. Catch and release only, artificial lures only. I'd say it's slightly less difficult than Sour Grass trail.

I'm pretty sure all the orange colored roads going to Crawley are dirt roads that any car can get through.

I'll have to check out the other ones though, the Crater ones sound cool.