Gap in San Bernardino County, California
Impassable Pass is a gap in Alvord Mountain, in San Bernardino County, California. It is located just south and outside of the boundary fence of Fort Irwin National Training Center.[1]: 12–13, 15
- ^ Edward Leo Lyman, Overland Journey from Utah to California: Wagon Travel from the City of Saints to the City of Angels, University of Nevada Press, 2008.