Granite Construction Inc. is a civil construction company and aggregate producer, a member of the S&P 600 Index based and founded in Watsonville, California, and is the parent corporation of Granite Construction Company. The company is both a heavy civil construction contractor and construction aggregate manufacturer, owning or leasing quarries in several Western states for extracting mostly sands, gravel, and crushed stone products. Granite Construction Company is composed of a construction materials division, and three construction operating divisions. Under each group are numerous regional offices, quarries, asphalt and concrete plants. Granite's California Group comprises five regions, based on geographically limited areas within the state. Granite's Central Group comprises six regions, representing states and specific markets outside of California: Arizona, Texas, Florida, Illinois, and Federal Division based in Colorado. Granite's Mountain Group comprises five regions, representing states and specific markets in Alaska, Washington, Oregon, Idaho, Nevada, Utah and the Water/Mineral Division.