A Guess
Guessing, but that road is probably perfectly OK, if a bit bumpy, 350 days of the year. It's just that a very heavy rain or, in some parts of the US "Mud season" can reduce the road to a bog. Mud Season -- for those who are unfamiliar -- is a short period in Spring in cold climates when the road surface thaws and the underlying material is still frozen and thus is impermeable. Result -- near instant swamp. Mud season roads in Vermont have been known to temporarily swallow even tracked vehicles like bulldozers.
That said, both the Internet, (Google) and canned information (Garmin) have been known to recommend some rather odd routes. I'm fine with unpaved roads. But I generally turn around when the road is so rarely used that plants are growing in the track.