The stretch from Lang Bay to the Spring Lake Main is in great condition, easily 2WD accessible. No logging activity or closures as of this post, but that may change.
The road is totally fine up to Goat lake for a 2WD. To get to climbers camp the road has a few spots in which I am not sure you could pass with just any 2wd. After climbers camp the road just gets worse and worse, and would require 4wd access. After the center lakes turn off it is almost not worth continuing with a vehicle, unless you have a small high clearance 4x4, as there is really not any good place to turn around. It is better with a quad.
After the Climbers campground the roads becomes way more degraded, and a high clearance 4x4 is required