Grass-Valley is a small community located in Sherman County, Oregon. The area is characterized by a semi-arid climate, with hot summers and cold winters. The hydrology of the area is dominated by the John Day River, which runs through the valley. The river provides ample opportunities for fishing and water sports, such as rafting and kayaking. Outdoor recreation opportunities in the area also include hiking and camping, with nearby destinations such as the John Day Fossil Beds National Monument and the Deschutes River State Recreation Area. The area is known for its natural beauty and peaceful rural lifestyle.