USGS Topographic Maps
Topo Maps Mashup
Drag slider to change topographic map opacity.
70% opacity

Background Data

View the USGS topographic maps ("quad maps") with either Google's aerial photography or a hillshade effect.

Click on the map to display coordinates.

I developed this page in response to TopoZone becoming a pay-service. This data is free and should remain free and available to the public.