DescriptionSources point to several different origins for the name Lolo (see Lolo). On September 13, 1805, the Lewis and Clark Expedition ascended Lolo Pass and continued west on their arduous trek to the Pacific Ocean. Other Name(s)Lolo Creek and PassContributing InstitutionMontana Historical Society Library and ArchivesGeolocation[1] Elevation5235 ft.CountyMissoula County