1872 "We camped the night of August 21 in a very romantic place, at the junction of Gibbon's Fork with the Madison. Gibbon's Fork is a beautiful stream that flows into the Madison on the east side, about 100 feet wide, quite unknown on any of our maps. We have named this stream in honor of General John Gibbon, United States Army, who has been in military command of Montana for some years, and has, on many occasions, render the survey most important services." (Sixth Annual Report of the United States Geological Survey of the Territories, embracing Portions of Montana, Idaho, Wyoming, and Utah; being a report of progress of the explorations for the year 1872 by F.V. Hayden)
1884 Embar Post Office was established on August 21, 1884 in Fremont County prior to the formation of Hot Springs County.