Location: 50.64528,-123.51167 50:38:43, -123:30:42 10U 463824 5610505 (4 km SW of Keyhole Falls). (62 km NW of Pemberton). NTS Mapsheet: 092.J.12 AreaCode: FM03/GF41 First Ascent: 1932 N. Carter; A. Dalgleish; T. Fyles
Plinth is the most recent volcano to erupt in the Garibaldi Volcanic belt. The huge eruption sent ash as far as Edmonton and dammed the Lillooet River forming Keyhole Falls. The steep north face is the remnant of the inner crater wall.
Plinth was first climbed in 1931 by a party who approached via horse from Pemberton. The Lillooet River was easy travelling that year because huge landslides from Devastator Peak and subsequent dam outburst floods had left miles of flat gravel bars along the channel instead of bush.