Federal Agency Maps
Topographic maps and land data from USGS, NPS, USFS, and BLM
Federal agencies maintain authoritative map data for public lands across the US. These resources cover topographic maps, trail networks, land ownership, and facility data. Most are free and publicly accessible.
- CalTopo / SARTopo Web App — powerful map-building tool used by SAR teams and backcountry travelers. Overlays USGS topos, satellite imagery, slope angle shading, land ownership, fire history, and more. Free tier available.
- USGS National Map Viewer Web — USGS topographic maps, elevation data, hydrography, and land cover. Grab 7.5-minute quads as GeoPDF files.
- USGS US Topo Maps Web — current-generation USGS topographic maps with ortho imagery layers.
- National Park Service GIS Data Web — park boundary, trail, road, and facility data for all NPS units.
- USFS Interactive Map Web — Forest Service visitor maps, motor vehicle use maps (MVUMs), and forest data.
- BLM Maps Web — Bureau of Land Management land ownership, recreation areas, and surface management maps. Useful for identifying public vs. private land boundaries.