Not sure about Shasta but I suspect most of the rain went south. Your story reminds me of commuting from N ca to Barstow on 99 in the winter. It would be so foggy one could not find their way back onto the hiway if you got off. 101 to San Luis was almost as bad.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT