The Lewis-Clark Valley AVA’s soil is comprised of decomposing perennial grasses and grass roots with capacity to hold water. The majority of soils contain loess, or wind-deposited, nutrient-rich silt. The region has good planting areas that are easy to develop and contains air drainage characteristics that are ideal for wine grapes. It also contains steep sides within shallow, stony surficial coverage for both classic and exotic vineyard sites.

Designated in 2016.
Formed by the Snake and Clearwater rivers, the Lewis- Clark Valley AVA consists of canyon side and bench lands and is 306,658 acres in size.
About 72% (219,838 acres) of the Lewis- Clark Valley AVA is located in Idaho, the rest in Washington.

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