Invasive golden mussels may have been spotted in Butte County last week, raising concerns about the potential impact on local water resources. A recent watercraft inspection at the Thermalito North Forebay prevented what is suspected to be the invasive species from entering the water, marking only the second time they have been seen at the site. … The Oroville facilities, including the Thermalito Forebay, Thermalito Afterbay, and Lake Oroville, supply water to roughly 23 million Californians.