The campuses of Willamette University and Chemeketa Community College lie within the city limits of Salem, and the campus of Corban University is just outside the city in unincorporated Marion County. The State of Oregon is the largest public employer in the city, and Salem Health is the largest private employer. Transportation includes public transit from Cherriots (legally known as Salem Area Mass Transit District), Amtrak service, and non-commercial air travel at McNary Field. Major roads include Interstate 5, Oregon Route 99E, and Oregon Route 22, which connects West Salem across the Willamette River via the Marion Street and Center Street bridges.