Watt/I-80 is a side platformed Sacramento RT light rail station in North Highlands, California, United States. The station was opened on March 12, 1987, is operated by the Sacramento Regional Transit District, and is the northern terminus of the Blue Line. The station is located in the median of Interstate 80 below Watt Avenue. Since the opening of the light rail system, Watt/I-80 was the terminus of the original alignment of the Watt/I-80–Downtown–Butterfield (later Mather Field/Mills) line until 2005 when RT reconfigured the light rail lines.