For a comparison to historical averages, see California Department of Water Resoruces Reservoir Conditions. Where the historical average calls for about 2/3 capacity, most reservoirs are at about 1/3, some markedly less (10%).<p>You'll get percent-of-average from Reservoir Water Storage (By Hydrologic Region), with historical data for selected years to 1977.<p>A plot for Lake Oroville showing annual patterns for current, wet, and dry years: Lake Oroville Storage Level Graph.<p>URLs in the Reddit comment below, apologies but moblie cut & paste stinks.<p><a href="http://www.reddit.com/r/collapse/comments/2ebhyx/images_3_years_apart_showing_the_severity_of/cjycrx5" rel="nofollow">http://www.reddit.com/r/collapse/comments/2ebhyx/images_3_ye...</a><p><a href="http://cdec.water.ca.gov/cdecapp/resapp/resDetailOrig.action?resid=ORO" rel="nofollow">http://cdec.water.ca.gov/cdecapp/resapp/resDetailOrig.action...</a><p><a href="http://cdec.water.ca.gov/cgi-progs/reservoirs/STORAGEW" rel="nofollow">http://cdec.water.ca.gov/cgi-progs/reservoirs/STORAGEW</a><p><a href="http://cdec.water.ca.gov/cgi-progs/products/rescond.pdf" rel="nofollow">http://cdec.water.ca.gov/cgi-progs/products/rescond.pdf</a>