You'll see signs for Thunder Mountain Connector if you're coming from the northwest or Bearhole Lake Connector if you're coming from the southeast.

This one is generally held to be an ATV trail but is actually a more or less decent old FSR and probably sees more traffic from 'normal' (ish) vehicles than anything else. No significant ditches but a couple of very steep gravel wash climbs towards the Bearhole Lake end mean you will probably have a bad time in a 2wd vehicle.