A Mauston man was injured as a result of a one-vehicle accident in Adams County.  The deputy said last Friday morning about 1am 23-year old Aaron Nelson was traveling west on Highway 21 near 4th Avenue in the Town of Richfield.  Nelson told the deputy a deer ran onto the roadway.  He hit the brakes of the 2011 Peterbilt he was operating.  The semi started going sideways, crossed the oncoming lane of traffic, entered the ditch striking several trees.  The tractor-trailer was severely damaged.