Porphyry Ridge is a ridge located in Lemhi County, Idaho. It appears on the Blackbird Mountain USGS 7.5-minute topographic quadrangle. The nearest populated place is Forney, approximately 6.2 miles to the SE.
Lemhi County · Idaho
Porphyry Ridge is a ridge located in Lemhi County, Idaho. It appears on the Blackbird Mountain USGS 7.5-minute topographic quadrangle. The nearest populated place is Forney, approximately 6.2 miles to the SE.