Chimney Rock Farm An original watercolor painting, 10 by 14 on 100 pound paper, can be matted for a 16 by 20 frame. Members of the Pagosa Plein Air Painters met at Chimney Rock Farm to capture surrounding crops, orchard, and hills from the shady porch of the farm market. The Chimney Rock Farm is the only USDA Certified Organic farm in Southwest Colorado. Berries, tree fruit and vegetables are all nourished by the free-flowing Piedra River.