Highway 21 Avalanche
The length of the closure, 13 days (March 3-16), made for the longest closure of the highway in at least the last six years. Until about 1986, however, this stretch of road was closed for the entire winter every winter as a concession to the avalanche threat. Avalanche has been the reason for eight of the nine longest highway closures in the state since the beginning of 2008. Photos and Info via ITD.