Heavy snowfall and icy conditions have forced the closure of I-17 northbound at SR 179, according to Arizona Department of Transportation.
The closure is at milepost 299.
While southbound lanes remain open in the area, snow and ice are creating difficult driving conditions and delays on I-17 between SR 179 and I-40 in Flagstaff.
There is no anticipated time to reopen northbound lanes, according to ADOT.
For the most current information about highway closures and restrictions statewide, visit ADOT's Travel Information Site at www.az511.gov, follow ADOT on Twitter (@ArizonaDOT), or call 5-1-1.