Since nobody else has responded yet...even though I can't give you a definitive answer, I'll offer my guesses...and this handy (I hope) map -- handy for referring to possible routes, if nothing else:
The routes in red on my map are paved, blue is unpaved, yellow is unpaved and (generally) less-traveled/more-primitive.
By "overland" I assume you mean unpaved roads?
Referring to map alternatives A, B, and C, with subroutes A1 and A2 and connectors X, Y, and Z:
- I've never driven any of these in mid-winter, though I've driven them all in summer/fall (B just this past October on the way to the Rally, and A2 just last week after T-day).
- We know that the Stolpas got stuck in snow somewhere along -- or just off -- A2, and lost part of their feet to frostbite...so that's one data point to consider.
- Routes A (with either northern sub-route) and B both include stretches over 6000 feet. Route C is not much over 4000 feet at any point. Not only is it the lowest-elevation, it is also the eastern-most and so the most rain-shadowed (driest) of the 3 major alternatives.
- I've been down C (which takes off from 140 at Leonard Creek Rd) as far as King Lear Pk many times -- grilled a whole turkey on T-Day at the mouth of McGill Cyn (below King Lear Pk) twice. I've continued on down to Sulfur and over to Gerlach at least 3 times. That east arm of the Black Rock is the least-visited part of that desert -- I love it! I would be willing to bet that it would be passable at any time in the winter, barring a major blizzard. It probably becomes less passable in spring as run-off crosses the road -- mainly near Jackson Creek -- and makes it muddy.
- C, however, doesn't go through any of the Sheldon Refuge, and it has the most pavement...but that pavement -- 140 -- is a pretty lonely road, it feels pretty wild and it passes over some of the highest high-desert you can drive on a paved road -- over 6000 feet. It's a highway where you could urinate in the middle of the road in the middle of the day and probably not violate anyone's sensibilities.
...except for the feral donkeys who might be watching.
- If winter snows (or spring mud) weren't a factor...then it seems like a cool wander that includes much of Sheldon Wildlife Refuge would be to take off 140 at A1, then take X over to A2, then Y over to B, then Z over to C, then follow that down to Gerlach. Of course, there are more-primitive roads/tracks all through there.
Overall, whether or not A or B -- and/or X, Y, Z -- are passable in winter depends somewhat on the winter (i.e., wet or dry). Because it's high desert, it's not an area that gets really deep snow -- not like similar elevations in the Cascades anyway, but because there are winds there can be deep drifts, drifts too deep to pass. And these routes are all marked "
not maintained in winter" or even "
closed"
An all-paved (almost-all-weather) fall-back option (not drawn on the map, but the roads are shown) is taking US 395 from Lakeview to just north of Alturas, then 299 to Cedarville , then south to Gerlach on 447. It is all pavement, but once you get to the south end of the Surprise Valley it's a very remote/wild high-desert drive (other than during the Burning Man season, when it becomes the primary route to that fest from the Northwest).
I bet that your best WTW source of first-hand experience with these roads is Mr.
Smokecreek1.
His profile says he worked and played all through this area. His profile shows that he hasn't been on WTW since you posted this. Maybe send him a PM and/or email?
Happy (and safe) trails!
- Mark