A clear deep pool, West Geyser has a minimal sinter rim, but soft and fractured sinter surrounding the pool. Looking into the pool, old branches are visible at the bottom, now covered and white from silica precipitation. The slight sinter shelf along the edge of the pool with shallow water has a rim of yellow/orange thermophiles. West Geyser erupted after the 1959 earthquake, but were not directly observed—only evidence of the water erupting or splashing. There were eruptions in the 1980s, but only overflowing of the pool has occurred since.

West Geyser has an average temperate of 159.1°F (70.6°C), an average pH of 7.9, and an average conductivity of 2171 uS/cm.

Geysers

Geysers have constrictions in their plumbing systems that prevent water from moving freely to the surface where heat would escape. Water beneath the constrictions creates a buildup of steam. Eventually the steam pushes water past the constrictions and the geyser erupts.

Use Caution in Hydrothermal Areas

• Stay on boardwalks and designated trails.
• Hydrothermal water can severely burn you.
• Never run, push, or shove.
• Supervise children at all times.
• Do not scratch hydrothermal mats.

You are responsible for your safety.

Think safety, act safely. Yellowstone is a dangerous place.