Marinette County Sheriff Jerry Sauve says the woman was trying to turn left onto U.S. Highway 41 from an access road about 10:45 a.m. Tuesday when she was struck broadside by the ambulance.
The driver of the ambulance, an attendant and a patient were taken to a Marinette hospital.
Names of the victims have not been released.
The snowmobile trails opened in Vilas CountyFriday at 5 p.m.
1908 Grand Avenue, Wausau, WI 54403
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