1.Starting at EXIT 452
2.Turn NORTH onto US-312 E / US-87 N / MT-3 TRUCK N.
3.Continue to follow US-312 E / US-87 N    3.5 miles
4.Turn SLIGHT LEFT onto US-87  at blinking the light
5.Turn RIGHT after 1.4 miles. There is a sign at the gate.

 

For those of you with GPS the coordinates to the gate are:

45° 51.782' N

108° 28.134' W