trends NW to Fourth of July Creek, 7 mi. WSW of that stream's junction with Yukon River and 33 mi. NW of Eagle, Yukon-Tanana Highlands.
Union Creek was reported in 1938 by Mertie (1942, p. 250), U.S. Geological Survey (USGS).
Barney Creek, Bear Creek, Bull Creek, Butte Creek, Canyon Creek, Crowley Creek, Deer Creek, Dewey Creek, Fourth of July Creek, Glenn Creek, Gold Creek, Granite Creek, Keenan Creek, Little Washington Creek, Logan Creek, Michigan Creek, Placer Creek, Placer Creek, Ruby Creek, Ruby Creek, Schley Creek, Sonickson Creek, Suter Creek, Sutter Creek,
Valleys:Eight Gulch, Independence Gulch, Lucky Gulch, Owl Gulch, Seven Gulch, Seventeen Gulch, Ten Gulch, Thirteen Gulch, Union Gulch,
Waterfalls: