The Blackrock Ranger District is comprised mostly of the Teton Wilderness. It borders Grand Teton and Yellowstone National Parks. It is home to the headwaters of the Yellowstone River and the Continental Divide. NEW : Teton Division Over Snow Vehicle Use Map October 2016 Office hours: 8:00 am - 4:30 pm Monday through Friday Blackrock Ranger District Hwy 26/287 P.O. Box 278 Moran, WY 83013 307-543-2386 Fax: 307-543-9149