The Yuba river's flow is controlled by the dam at Lake Englebright and with the "Big Strom" coming the dam was opened by the California Dept. of Water Resources which blew the river out.
The Yuba fishes well when it's flow is below 2,000 cubic feet per second like it was on Dec 17th. Today it is running at 3,000.
At this point I'm not sure what has been more hyped the Big storm or the end of the world. I'm leaning toward the storm as it has been are larger disappointment.
If you plan to travel to fish the Yuba river system, I would suggest contacting Tom Page at Reel Anglers Fly Shop in Grass Valley as he is full of local knowledge and he is not your typical shop owner as he is willing to share information.