Up near Avenue of the Giants is a memorial to Weott, a small town that was wiped out twice by flooding from the South Eel River -- once in 1955 and then again in 1964 -- but I've never seen corn grown there!
But then.... I got to thinking.... you're clues are always clever.....And then it hit me -- Weed, California is both relatively high in elevation and descriptive... so the town must be Weed and there have some some massive floods in Weed!.
The highway....Could it be along Old Highway 99?
Mark