This biker bar is supposed to be located "on the California/Nevada border. But it isn't.
This scene was actually shot in the same desert location as the "Death Valley motel" scenes in
the previous episode: at a permanent movie set called "Four Aces", built out in the Mojave desert.
The compound is composed of a fake motel, a fake gas station and a fake diner, all of which
boast real interiors, as well as an additional bar interior - where parts of this scene were filmed.
All they did was to shift their focus from the set's fake motel to its fake gas station,
and fixed up the front of the gas station building to resemble a bar entrance.
And of course, they changed the "Four Aces" sign outside to read
"Rosie's Desert Oasis" (promising "Hops, Hogs, Honeys").
"Four Aces" is located at 14499 E. Avenue Q, five miles east of Palmdale, CA
about 35 miles northeast of Six Flags Magic Mountain,
and a good 75 miles northeast of downtown Los Angeles.
The Four Aces is used often by Hollywood, including once for an episode of "The O.C."
Here is a photo of the Four Aces' gas station (and its original sign):
(You can read more about Four Aces on their own website.)
Here is a
StreetView of the Four Aces.
(Spin that panorama around, and you're looking at those Joshua trees.)
[ The scene of Lady Sif appearing suddenly in front of the S.H.I.E.L.D. caravan seems
to have been filmed nearby, in the same general Mojave desert area, given those
Joshua trees and the matching view of the mountains to the south. ]