This is really neat footage of the eruption of the volcano in our backyard. Lassen Peak erupted on May 22, 1915 and the event was caught on film by Justin J. Hammer of Red Bluff. The film comes from the Shasta Historical Society.
According to the Lassen Volcanic National Park website:
On May 22, 1915, an explosive eruption at Lassen Peak, the southernmost active volcano in the Cascade Range, devastated nearby areas and rained volcanic ash as far away as 200 miles to the east. This explosion was the most powerful in a 1914-17 series of eruptions that were the last to occur in the Cascades before the 1980 eruption of Mt. St. Helens. Lassen Peak is the largest of a group of more than 30 volcanic domes erupted over the past 300,000 years in Lassen Volcanic National Park.
For more information, including eyewitness accounts, read The Lassen Peak Eruptions & Their Lingering Legacy, by Alan Willendrup, published by The Association for Northern California Historical Research.