You should have brought some with you.
Our local kids ski club was so depressed about the lack of snow here in Oslo that they trucked up 86 truckloads of bandy field scrapings (aka crushed ice) to make a skiable 500m loop. How many truckloads from Truckee would it take to make Birkie course great again?
500 m X 100 = 50 km. So 8600 truckloads ought to do it. Oh, and freezing over Lake Hayward would help.
I think that's a low estimate. To cover those odd-balls who still stride, a parallel track is needed for about half, so multiply by 1.5. The oslo kids probably only have about 2 skiers worth of width, which is not enough for the Birkie. Thus, I'd say another factor of 2 is needed to get some width.
2 * 1.5 * 8600 = 25,800 truck loads.
I'd rather do it out and back, so maybe we could just use 4300 truckloads and have two-way traffic. Much more interesting.
That could be fun! Though I will switch to aluminum poles, which might make for better jousting lances. Costs for medical care will go up.
In Stockholm, we did lay out a track very early in the season using the scrapings from a hockey rink next door. Good workouts and team bonding in many ways! - And then it melted...