Bridge River Vent

Bridge River Vent is the youngest known vent of the Mount Meager massif in southwestern British Columbia and the only one known to have been active within the past 10,000 years. Formed about 2,350 years ago on Plinth Peak, it produced what is regarded as Canada’s largest known explosive eruption of the last 10,000 years. Ash rose high into the atmosphere and spread as far as Alberta, while pyroclastic flows burned and buried forest and lava-dome collapses sent hot debris into nearby valleys. Volcanic material temporarily dammed the Lillooet River, triggered an outburst flood, and left lasting landscape features including Keyhole Falls and a preserved dacite lava flow.

British Columbia · Canada