<P> The Volcano at the southern end of the Northern Cordilleran Volcanic Province just north of the Alaska - British Columbia boundary is probably the youngest in Canada . It is a poorly built cinder cone made of loose volcanic ash , lapilli - sized tephra and volcanic bombs . Lying above a remote mountain ridge in the Boundary Ranges of the Coast Mountains , it is responsible for lava flow eruptions in 1904 and older that traveled south 5 kilometres ( 3 mi ) through river valleys where they crossed the border into the U.S. state of Alaska and dammed the Blue River , a short tributary of the Unuk River . In doing so it formed several small lakes . This eruption had a massive effect on fish , plant and animal inhabitants of the valley , but there is no record of its impact on people , most likely because people were not in the remote area . The entire length of the lava flows are at least 22 kilometres ( 14 mi ) and still contain the original lava features from when they were erupted , including pressure ridges and lava channels . However , sections of the lava flows have collapsed into underlying lava tubes to form cavities . Tephra and scoria from The Volcano covers adjacent mountain ridges and even through it is very young , it has been reduced by erosion from alpine glacial ice found in the heavily glaciated Coast Mountains . The estimated volume of lava and ash from The Volcano is 2.2 km ( 1 cu mi ) . </P>
<P> The Volcano at the southern end of the Northern Cordilleran Volcanic Province just north of the Alaska - British Columbia boundary is probably the youngest in Canada . It is a poorly built cinder cone made of loose volcanic ash , lapilli - sized tephra and volcanic bombs . Lying above a remote mountain ridge in the Boundary Ranges of the Coast Mountains , it is responsible for lava flow eruptions in 1904 and older that traveled south 5 kilometres ( 3 mi ) through river valleys where they crossed the border into the U.S. state of Alaska and dammed the Blue River , a short tributary of the Unuk River . In doing so it formed several small lakes . This eruption had a massive effect on fish , plant and animal inhabitants of the valley , but there is no record of its impact on people , most likely because people were not in the remote area . The entire length of the lava flows are at least 22 kilometres ( 14 mi ) and still contain the original lava features from when they were erupted , including pressure ridges and lava channels . However , sections of the lava flows have collapsed into underlying lava tubes to form cavities . Tephra and scoria from The Volcano covers adjacent mountain ridges and even through it is very young , it has been reduced by erosion from alpine glacial ice found in the heavily glaciated Coast Mountains . The estimated volume of lava and ash from The Volcano is 2.2 km ( 1 cu mi ) . </P>
when did a volcano last erupt in canada
when did a volcano last erupt in canada
1904
1904