From Drew Decker:
New 1:24,00-scale topographic maps are now available for download for California. These maps include several new datasets and data updates (such as revised NHD in Ventura and Tehama Counties, and some crowd sourced structures) as compared to the last maps released in 2012. We will talking more about the new maps at the 2015 CalGIS conference in June. Please see the link below for the recent USGS news release:
http://www.usgs.gov/newsroom/article.asp?ID=4173&from=rss_home