On December 30, 2000, a tanker truck operated by Advanced Fuel Filtration Systems, Inc. (AFFS) of Corona, California overturned on California State Route 182 north of Bridgeport, California resulting in the release of approximately 3,608 gallons of #6 fuel oil, the majority of which entered into the East Walker River. The fuel visibly oiled approximately ten miles of stream habitat, seven of which were in California (Mono County) and three in Nevada (Lyon County). Based on water and sediment samples taken downstream in Nevada, approximately 15 miles of stream were impacted. This oil spill impacted natural resources along the spill path of the East Walker River watershed, causing injury and mortality to plants and animals.