A Mauston woman was involved in a one-vehicle accident Tuesday afternoon.  The deputy said about 1:30pm 69-year old Bonnie Porter was traveling north on County Road ‘K’ in the Town of Seven Mile Creek.  As she rounded a curve, Porter lost control of the 1994 Pontiac Oldsmobile.  The car entered the ditch and struck a tree.  Neither the driver nor a passenger, 83-year old Harry Porter, were injured.