Oroville Reservoir is a large artificial lake located in Butte County, California. It was created by the construction of the Oroville Dam on the Feather River and serves multiple purposes, including water supply, flood control, and hydroelectric power generation. The reservoir has a capacity of about 3.5 million acre-feet, making it one of the largest in the state. The surrounding area offers recreational opportunities such as fishing, boating, and hiking. The California Department of Water Resources manages the reservoir, ensuring its operation and maintenance while also providing public access to its natural beauty and resources.