Feb, 2015 -- Newly released US Topo maps for Nevada now feature selected trails. The data for the trails is provided to the USGS through a nation-wide “ crowdsourcing” project managed by the International Mountain Biking Association ( IMBA). Several of the 1,785 new US Topo quadrangles for the state now display public trails along with other improved data layers such as land survey information (PLSS), map symbol redesign and new road source data.

"Users of the US Topo maps in our state are excited about the release of these new versions," said Carol Ostergren, The National Map Liaison for Nevada. "Nevada features numerous trails, so the addition of several mountain bike trails will increase the use of the new US Topo maps. Also, adding PLSS will assist many of our users who have been asking for that data for a long time."

For Nevada residents and visitors who want to explore the stunning desert landscape on a bicycle seat or hiking shoes, 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 mountain bike 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 and ensure accuracy and confirm that 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 important addition to the new Nevada US Topo maps is the inclusion of Public Land Survey System data. PLSS is a way of subdividing and describing land in the United States. 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 Nevada 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/

Updated 2015 version of Boulder City, Nevada quadrangle with orthoimage turned on. (1:24,000 scale. ( high resolution image 1.1 MB)	Vintage 1886 quadrangle covering the Boulder City, Nevada and Camp Majove, Arizona area from the USGS Historic Topographic Map Collection. 1:25,000 scale. ( high resolution image 1.6 MB)	Updated 2015 version of Boulder City, Nevada quadrangle with orthoimage turned off to better see the trail network. (1:24,000 scale) ( high resolution image 610 KB)

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Larry Moore
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