Elk Creek—D : 9—Named prior to 1870—Characteristic.
Elk Tongue Creek—C : 12—U. S. G. S.—Characteristic.
Escarpment Creek—Q : 13—1885—U. S. G. S.—Characteristic.
Fairy Creek—J : 4—1871—Barlow—From “Fairy Falls,” which see.
Falcon Creek—R : 13—1885—U. S. G. S.—Characteristic.
Falls River—S : 1—1872—U. S. G. S.—Characteristic.
Fan Creek—C : 2—1885—U. S. G. S.—Characteristic.
Fawn Creek—C : 5—1878—U. S. G. S.—Characteristic.
Firehole River—I : 4—This name and “Burnt Hole” have been used to designate the geyser basins and the stream flowing through them since at least as far back as 1830. Captain Bonneville says it was well known to his men. The term “Hole” is a relic of the early days when the open valleys or parks among the mountains were called “holes.” The descriptive “fire, naturally arose from the peculiar character of that region.”
Firehole, Little—L : 4—1878—U. S. G. S.—From main stream.