Remember that the helicopter visibility restriction also applies to IFR departures. under part 135, you can depart IFR without a takeoff alternate if you have the visibility to shoot the approach straight in, and all the equipment is working... this visibility can be cut in half unless it says helicopter vis reduction N/A.
So, looking at this approach plate alone would still not answer your question. But, if you look at the other VOR/DME B approach you can see that the required vis is 1.25sm vis. Helicopters would usually be allowed to cut that in half and therefore depart IFR without a takeoff alternate if the vis was .625sm vis.
I looked it up, but they seem to have removed the limitation as of me writing this. But I would be curious if they had that limitation on all of Lemhi's approaches in order to limit the IFR departure to 3/4sm.