Mount Lassen NP

11. Bumpass Hell

Here we stop and let Mom view the Bumpass Hell area from above. Of course Paul and the boys went on down to the main area. Bernice stayed above with Mom. Bumpass Hell is the largest hydrothermal area in the park, and marks the principal area of upflow of steam and discharge from the Lassen hydrothermal system. The temperature of high-velocity steam jetting from Big Boiler, the largest fumarole in the park, has been measured as high as 322°F (161°C), making it one of the hottest fumaroles in the world. The steam heated waters are typically acidic and are not safe, even for bathing. Please stay on the trail and boardwalks for your safety.