Beaver Creek is a 180-mile tributary of the Yukon River in the U.S. state of Alaska. The creek begins at the confluence of Champion and Bear creeks in the White Mountains National Recreation Area, about 50 miles north of Fairbanks. From there it flows west around the southern end of the White Mountains, then northeast into the Yukon Flats National Wildlife Refu…Beaver Creek is a 180-mile tributary of the Yukon River in the U.S. state of Alaska. The creek begins at the confluence of Champion and Bear creeks in the White Mountains National Recreation Area, about 50 miles north of Fairbanks. From there it flows west around the southern end of the White Mountains, then northeast into the Yukon Flats National Wildlife Refuge, then west into the Yukon River downstream of Beaver.