Cal. Water Code § 11240

The unit designated as the Tehama-Colusa Canal consists of a conduit or canal, equipped with the necessary dams, pumping plants, groundwater recharge facilities, and other related works extending from the Sacramento River, at or near Red Bluff, southerly through the Counties of Tehama, Glenn, Colusa, Yolo, Solano, and Napa, and serving those counties.