High Quality Content by WIKIPEDIA articles! The Clements Hills AVA is an American Viticultural Area located in San Joaquin County, California. It is located in the southeast part of the larger Lodi AVA. The Mokelumne River flows through the wine region, which is composed of rolling hills between 90 feet (27 m) and 400 feet (122 m) in elevation. A variety of microclimates exist within the hills of the region. The soils in the area includes loams, clay loams, and clays. Below the alluvial top soil are areas of granite and volcanic soils.