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This would be part of a road connecting Reno, Nevada and Klamath Falls east of the Sierra Nevada, which would attract heavy traffic and improve access to Crater Lake and Lassen Volcanic National Parks.
Banner Lassen Medical Center and Lassen College in Susanville, Lassen County, California, Lassen National Forest, Lassen Peak and Lassen Volcanic National Park are named after him.
The 500-mile Volcanic Legacy Scenic Byway is an auto tour of northern California's volcanos and begins at Lassen Volcanic National Park, then to Mount Shasta and ends at Crater Lake National Park.