NM County Tri-Point Locations: Bernalillo, Santa Fe, Torrance Counties. 35.04010N 106.24387W.
Located just a bit south of I-25, the road turns to dirt for about 1 mile, making for slippery going when wet. There is currently a SASS (Single Action Shooter's Society) sign on the fence at the corner indicating the Founder's Ranch. The signs are temporary so may not be here next trip out. Above is a picture facing East from the T intersection with Barton Road.
Below is a picture of the corner of the Founder's Ranch. http://www.foundersranch.com/ where the SASS meets.