Yes, here are websites which shows the status of some of major reservoirs in California:
http://oroville.lakesonline.com/Level/
http://shasta.uslakes.info/Level/
http://mead.uslakes.info/level.asp
Keep in mind that Lake Mead is fed from the Rocky's, via the Colorado river, which means that these recent storms in California have had no significant impact on the level of the lake, unlike the what's happening at Oroville and Shasta.