Looks like a grader has gone up the entrance of the spur a few yards and pushed a bunch of debris in the way. Might be able to get through on a dirtbike but you'll most likely be getting whacked by alders all the way up if it's even rideable.
Hasn't seen industrial use in several years but still looks like it might be driveable for a bit at least (if you get past the gate at KM2 on Bear Creek) or easily bikeable. Did not travel this road, just rode past