Impassable Pass
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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
Impassable Pass was a pass through Alvord Mountain for the Old Spanish Trail and the later wagon route called the Mormon Road, between Bitter Spring and Fork of the Road, the next water on the Mojave River. The pass overlooks Spanish Canyon below it to the south, through which this route a passed through the south facing slope of Alvord Mountain to the open desert beyond its mouth.[1]: 12–13, 52, 55, 66, 68, 79