Oroville is in Butte County in California. The population was 13,004 at the 2000 census, and it is one of the faster growing towns in California, with an 11.9% increase in population from 2000 to June 2007.
The Oroville Dam, perhaps Oroville's most famous site, is one of the 20 largest dams in the world, the largest earth filled dam in the US, as well as the tallest dam in the US. This dam is 770 feet (235 m) tall and 6920 feet (2109 m) long, and it impounds Lake Oroville, which has a capacity of 3,500,000 acre feet (4.3 km³) of water, making it the second largest reservoir in California. This is one of the most important parts of the California State Water Project (see also the Central Valley Project, a Federal undertaking). Both systems move water from water-rich Northern California to water-poor Southern California. This facility is operated by the California Department of Water Resources which is undergoing contract renewal with the City of Oroville and Butte County. The state has not paid any taxes on this facility nor developed the lake for recreation as originally promised which have been a bone of contention with the local government and residents.