https://maps1.arcgisonline.com/arcgis/rest/services/NGA_US_National_Grid/Map
https://maps1.arcgisonline.com/arcgis/rest/services/NGA_US_National_Grid/MapThis is a folder inside the services directory, not the server root. Trim back to /rest/services to connect to the whole server.
Stopped responding.
Also run by USGS - The national map
- https://basemap.nationalmap.gov/arcgis/rest/services
- https://index.nationalmap.gov/arcgis/rest/services
- https://partnerships.nationalmap.gov/arcgis/rest/services
- https://hydro.nationalmap.gov/arcgis/rest/services
- https://hydro-wfs.nationalmap.gov/arcgis/rest/services
- https://hydrowfs.nationalmap.gov/arcgis/rest/services
- https://3dhp.nationalmap.gov/arcgis/rest/services
- https://carto.nationalmap.gov/arcgis/rest/services
- https://cartowfs.nationalmap.gov/arcgis/rest/services
- https://carto-wfs.nationalmap.gov/arcgis/rest/services
- https://certmapper.cr.usgs.gov/arcgis/rest/services
- https://certmapper.cr.usgs.gov/server/rest/services
- https://elevation.nationalmap.gov/arcgis/rest/services
- https://imagery.nationalmap.gov/arcgis/rest/services
- https://eerscmap.usgs.gov/arcgis/rest/services
- https://co2public.er.usgs.gov/arcgis/rest/services
- https://nimbus.cr.usgs.gov/arcgis/rest/services
- https://services.arcgisonline.com/arcgis/rest/services/USA_Topo_Maps/MapServer
- https://edits.nationalmap.gov/arcgis/rest/services