Firefighters are battling a wildfire in Mariposa County on Highway 49 today. The Bridge Fire began on Friday afternoon near the William Sell Bridge between Oakhurst and Mariposa and has burned around 100 acres. Mandatory evacuations are in place for residents in the Ponderosa Basin area near the east fork of the Chowchilla River. A number of structures are threatened by the fire. Highway 49 is closed between Worman Road and Chowchilla Mountain Road.