On the homepage of the CalTrans site there's a clickable graphic advertising Quickmap, a collaboration with Google Maps. Here's the direct link:
http://quickmap.dot.ca.gov/Combines Google traffic and satellite layers with CalTrans' lane closures, CHP/CHIN incidents (clicking this box will show you which Sierra passes are currently open - 88 (Carson) and 4 (Ebbetts)), message signs, and a few other things.
My new go-to link for travel planning in California.
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