Sour Creek—H: 9—1871—Barlow—Characteristic.
Spirea Creek—R: 6—1885—U. S. G. S.—Characteristic.
Spring Creek—M: 5—1885—U. S. G. S.—Characteristic.
Spruce Creek—J: 6—1885—U. S. G. S.—Characteristic.
Squirrel Creek—N: 5—1878—U. S. G. S.—Characteristic.
Stellaria Creek—C: 3—1885—U. S. G. S.—Characteristic.
Stinkingwater River—L: 16—1807—John Colter—From an offensive hot spring near the junction of the principal forks of the stream. A most interesting fact, to which attention was first publicly called by Prof. Arnold Hague, is the occurrence on the map, which Lewis and Clark sent to President Jefferson in the spring of 1805, of the name “Stinking Cabin Creek,” very nearly in the locality of the river Stinkingwater. Prof. Hague, who published an interesting paper concerning this map in Science for November 4, 1877, thinks that possibly some trapper had penetrated this region even before 1804. But with Lewis and Clark’s repeated statements that no white man had reached the Yellowstone prior to 1805, it seems more likely that the name was derived from the Indians.
Straight Creek—E: 5—1885—U. S. G. S.—Characteristic.
Sulphur Creek—G: 9—1878—U. S. G. S.—Characteristic.—Locally this name is applied to a stream which flows from the hot springs at the base of Sulphur Mountain.
Surface Creek—G: 9—1885—U. S. G. S.—Characteristic.