From the USGS:
Several of the 2,798 new US Topo quadrangles for California now display public trails along with segments of the Pacific Crest National Scenic Trail. Also the new maps now show improved data layers such as public land survey information, map symbol redesign, enhanced railroad information and new road source data. Some of the data for the trails is provided to the USGS through a nationwide “crowdsourcing” project managed by the International Mountain Biking Association (IMBA).
“The USGS 7.5-minute quads have been the long time gold standard for wall to wall mapping in the United States.” said Tom Lupo, Deputy Director, Data and Technology Division, California Department of Fish and Wildlife. “To me, they are the second best thing the Federal government has ever done!”
For California recreationalists and visitors who want to explore the diverse west coast landscape on a bicycle seat, hiking, horseback or other means, the new trail features on the US Topo maps will come in handy. During the past two years the IMBA, in a partnership with the MTB Project, has been building a detailed national database of trails. This activity allows local IMBA chapters, IMBA members, and the public to provide trail data and descriptions through their website. MTB Project and IMBA then verify the quality of the trail data provided, ensure accuracy and confirm the trail is legal. This unique crowdsourcing venture has increased the availability of trail data available through The National Map mobile and web apps, and the revised US Topo maps.
Another trail system, provided through a USGS partnership with the U.S. Forest Service, is the Pacific Crest National Scenic Trail. This west-coast long NST joins the Pacific Northwest National Scenic Trail, the Ice Age National Scenic Trail, the North Country National Scenic Trail, and the Appalachian National Scenic Trail as being featured on the new US Topo quads around the nation. The USGS hopes to eventually include all National Scenic Trails in The National Map products.
The Pacific Crest National Scenic Trail is a treasured pathway through some of the most scenic terrain in the nation. Beginning in southern California at the Mexican border, the PCT travels a total distance of 2,650 miles through California, Oregon, and Washington until reaching the Canadian border. The PCT is one of the original National Scenic Trails established by Congress in the 1968 National Trails System Act and fifty-four percent of the trail lies within designated wilderness
Another important addition to the new California US Topo maps is the inclusion of Public Land Survey System data. PLSS is a way of subdividing and describing land in the US. All lands in the public domain are subject to subdivision by this rectangular system of surveys, which is regulated by the U.S. Department of the Interior.
These new maps replace the first edition US Topo maps for the Golden State and are available for free download from The National Map, the USGS Map Locator & Downloader website , or several other USGS applications.
To compare change over time, scans of legacy USGS topo maps, some dating back to the late 1800s, can be downloaded from the USGS Historical Topographic Map Collection
For more information on US Topo maps: http://nationalmap.gov/ustopo/
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