A hand crew working with Cal Fire works toward a wildland fire burning west of Winters near Lake Berryessa on Saturday, July 5, 2014. A fire in western Yolo County that sparked Friday night has grown to more than 5,000 acres, authorities said. The Monticello fire started just after 9:30 p.m. off Highway 128 at the Monticello dam on the southeast shore of Lake Berryessa, according to the California Department of Forestry and Fire Protection. The flames are five miles west of Winters. "That's the point where the three counties Napa, Solano and Yolo come together," said Cal Fire spokesman Daniel Berlant. "Accessibility is challenging lots of rolling hills, then you add the fact that the brush and trees are so dry." Officials said the fire is 25 percent contained, but that it grew hundreds of acres overnight. Several hundred firefighters are taming the flames, and 50 rural homes in Yolo County have been evacuated. "The concern right now are the homes outside of Winters," Berlant said, adding that the city itself wasn't under any threat. He said the cause of the fire is still under investigation.