Oregon Spirit Distillers Bourbon Whiskey is a four-grain bourbon made with corn, rye, wheat, and malted barley. This whiskey is made and aged for four years on site in Bend, Oregon. After four years of maturation in new American white oak barrels, the barrels are married and a touch of water is added to bring our whiskey to 94 proof. Oregon Spirit Distillers Bourbon stays true the sweet corn-on-the-cob nature of bourbon with a spicy cinnamon twist from the rye grain.