Before you drive

Road conditions

Mountain roads close on short notice. Passes drift over. Shuttles cancel. Here is the authoritative source for every region the atlas covers, pinned in one place.

United States

Western US
Region	Source
COColorado	COtrip (cotrip.org)
UTUtah	UDOT 511 (udottraffic.utah.gov)
IDIdaho	ID511 (511.idaho.gov)
WYWyoming	WYDOT 511 (wyoroad.info)
MTMontana	MDT 511 (mdt511.com)
WAWashington	WSDOT (wsdot.com)
OROregon	TripCheck (tripcheck.com)
CACalifornia	Caltrans QuickMap (quickmap.dot.ca.gov)
NVNevada	NDOT 511 (nvroads.com)
NMNew Mexico	NMDOT 511 (nmroads.com)
AKAlaska	511 Alaska (511.alaska.gov)

Northeast US
Region	Source
NHNew Hampshire	New England 511 (newengland511.org)
VTVermont	511VT (511vt.com)
NYNew York	511NY (511ny.org)
MEMaine	New England 511 (newengland511.org)

Canada

Region	Source
BCBritish Columbia	DriveBC (drivebc.ca)
ABAlberta	511 Alberta (511.alberta.ca)
QCQuebec	Quebec 511 (quebec511.info)

Mexico

Region	Source
MXMexico	SCT Mexico traffic (sct.gob.mx)

A note on mountain roads

Trailhead roads off these main DOT maps are often the ones that actually matter, and they are usually not reported by the state. For forest service roads and county roads to trailheads, cross-reference with the operator, the local ranger district, or a recent trip report. 4WD and chains seasons matter: Berthoud Pass and Red Mountain Pass in Colorado, Teton Pass in Wyoming, Galena Summit in Idaho, and Rogers Pass in BC all close hard in storms.