I-5 won't get you to Susanville regardless, but presuming you're just rambling around, this will take you (summer only, don't try this in winter snowy weather) thru some really pretty country. Its winding and uphill this direction, but very drivable. Have no idea about construction delays; you can check CalTrans site for info on that.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project