Jefferson Streets. The Minnesota Department of Transportation, meanwhile, handles State Highway 197, as well as U.S. Highways 2 and 71. For the city, snow and ice control usually begins with an accumulation of 2 inches or more. That level was reached over the past weekend. "When we get a snow event, especially one that's more than 4 inches, we plow all of our streets and make sure that before we leave, we get at least one pass on all of them," Gray said. "Our major corridors like Irvine Avenue, Division Street and 15th Street are much higher volume roads, so they get plowed a little bit faster and more often. But, we have enough rigs that we're able to pretty much get to every city street within an eight to 10 hour shift during a non-snow storm or blizzard."