Indian Creek—E : 6—1878—U. S. G. S.—See “[Bannock Peak].”

Iron Creek—L : 4—1871—U. S. G. S.—Characteristic.

Jasper Creek—D : 11—1885—U. S. G. S.—Characteristic.

Jay Creek—S : 13—1885—U. S. G. S.—Characteristic.

Jones Creek—K : 15—1880—Norris—For Captain (now Lieutenant-Colonel) W. A. Jones, Corps of Engineers, U. S. A., who first explored it. Captain Jones was leader of an important expedition through the Park in 1873, and has since been largely identified with the development of the Park road system.

Jumper Creek—J : 6—1885—U. S. G. S.—Characteristic.

Lamar River (5,970)—D : 10—1885—U. S. G. S.—For the Hon. L. Q. C. Lamar, Secretary of the Interior during the first administration of President Cleveland. The stream is locally known only by its original designation, the “East Fork of the Yellowstone.”

Lava Creek—D : 7—1885—U. S. G. S.—Characteristic.

Lewis River—R : 7—1872—U. S. G. S.—From “Lewis Lake,” which see.