Description Grouse Creek Ranch, located in Star Valley near the Idaho/Wyoming border, is a luxury mountain community that affords its residents the opportunity to experience rugged and untarnished natural beauty. Bordered on two sides by the 2.5+ million acre (4,000+ sq. mile) Caribou-Targhee National Forest, Grouse Creek Ranch consists of just 50 secluded lots (ranging from 5 to 20 acres each) situated on approximately 500 total acres.