Buhl is a city located on the old Oregon Trail in the western half of Twin Falls County, Idaho, United States. The population was 4,122 at the 2010 census, up from 3,985 in 2000. It is part of the Twin Falls Micropolitan Statistical Area.U.S. Route 30 passes through Buhl, along the scenic Thousand Springs Scenic Byway from Twin Falls to Bliss. Known as the "Trout Capital of the World," Buhl boasts numerous hatcheries in the immediate surrounding area, which produce a majority of the rainbow trout consumed in the United States. Clear Springs Foods, located just north of Buhl, processes over 20 million pounds of rainbow trout each year, making it the world's largest producer.