On 26 June 1983, a nest of the Plumbeous Solitary Vireo (Vireo solitarius plumbeus) was discovered at an elevation of 1810 m on Chimney Creek below Chimney Meadow, Kern Plateau, Tulare County, California. This observation may be the first record of this Rocky Mountain/Great Basin subspecies nesting on the west slope of the Sierra Nevada. Ned K. Johnson collected specimens in breeding condition on 23 May 1973 about 6 km northwest of Chimney Peak at an elevation of 2315 m (Johnson and Garrett 1974); no nest was found. Johnson’s specimen records are only 8 km northwest of the location described in this report.