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Prior to the 1884–85 [[Geological Survey]] of the park, the Lamar was known as the East Fork of the Yellowstone River. During that survey, Geologist [[Arnold Hague]] named the river for [[Lucius Quintus Cincinnatus Lamar (II)|L.Q.C. (Lucius QuinctiusQuintius Cincinnatus) Lamar]],<ref>{{cite book | url=https://archive.org/details/bub_gb_9V1IAAAAMAAJ | title=The Origin of Certain Place Names in the United States | publisher=[[United States Government Publishing Office|Government Printing Office]] | author=Gannett, Henry | year=1905 | pages=[https://archive.org/details/bub_gb_9V1IAAAAMAAJ/page/n179 180]}}</ref> then Secretary of the Interior (March 1885 – January 1888), and a former slaveholder and author of the [[Mississippi Ordinance of Secession]]. The Lamar Valley, or the ''Secluded Valley'' of Trapper [[Osborne Russell]] and other park features or administrative names which contain ''Lamar'' are derived from this original naming.<ref>{{cite book |last=Haines |first=Aubrey L. |title=Yellowstone Place Names-Mirrors of History |publisher=University Press of Colorado |location=Niwot, Colorado |pages=106–107 |isbn=0-87081-382-X |year=1996 }}</ref>
Osborne Russell in his 1921 ''Journal of a Trapper'' described the Lamar as follows:
