Not the only site. They are taking things down left and right. Probably will use it to hide things too.
Due to the Federal government shutdown, usgs.gov and most associated web sites are unavailable.
Only web sites necessary to protect lives and property will be maintained.
Ecosystems
Disease Maps
National Wildlife Health Center
Natural Hazards
USGS coastal erosion hazards information
USGS earthquake information
USGS emergency operations portal
USGS information on geomagnetic activity
USGS landslide information
USGS volcano information
Water
Please see doi.gov for more shutdown information.