Sulphur Works is a geothermal area located within Lassen Volcanic National Park in Northern California. It is one of the park's hydrothermal features, and it provides visitors with a fascinating glimpse into the volcanic activity that shaped the region.

Sulphur Works is situated in the southwestern part of Lassen Volcanic National Park, near the main park road. It's easily accessible, making it a popular stop for park visitors. The area is home to a variety of hydrothermal features, including boiling mud pots, steaming fumaroles, and hot springs. These features are a result of the volcanic activity associated with Lassen Peak, the largest plug dome volcano in the world.

As the name suggests, Sulphur Works has a distinct sulfuric odor due to the presence of hydrogen sulfide gas released by the geothermal activity. The smell is often described as similar to rotten eggs. A short boardwalk trail leads visitors through Sulphur Works, allowing them to view and experience the hydrothermal features up close while also ensuring their safety. The boardwalk is designed to protect both visitors and the fragile geothermal environment.

Pet-friendly: Yes, but must be kept on leash and please pack out their trash

Soft adventure: Yes

Seasonality: All seasons, but winter snow can cause road closures.

Fee: Park entry fees change from season to season ($10-$30)