Park highway under construction near Sulphur Works
Road crews are working to repair the road near Sulphur Works hydrothermal area. Road will be open, with one-way controlled traffic at Sulphur Works, during the Memorial Day weekend (5/24-5/27).
Explore the Hydrothermal Areas
Hydrothermal Area Danger
Visitors Have Been Injured When Traveling Off-Trail.
Access the largest hydrothermal area in the park via a 3-mile round-trip hike. A boardwalk takes visitors through a 16-acre bowl of plopping mudpots, bubbling pools, and roaring steam vents - including the super hot Big Boiler.
Little Hot Springs Valley
Boiling Springs Lake
Cold Boiling Lake
Did You Know?
Lassen Volcanic National Park started as two separate national monuments designated by President Theodore Roosevelt in 1907: Cinder Cone National Monument and Lassen Peak National Monument.