Located on Haystack, an andesite dome about 11 mile northeast of Weed, California, along US Highway 97. See Haystack for a brief description of the hike to the top.
Coordinates: N 41° 32.046 W 122° 16.763
NGS PID: MX1001
NOTES: According to the NGS data sheet for this mark, there are 3 reference marks associated with this station – as of this post date, I’ve located reference marks 2 and 3.