[2] It is very distinctive with clear blue water underneath and a base that is tinted orange.

[3] Solitary Geyser is accessible via the Observation Point loop trail behind Old Faithful.

In 1914, water was diverted to heat a swimming pool, resulting in the water level being lowered, allowing boiling to occur at depth.

This resulted in the geyser erupting regularly.

In 1951, the pool was removed, the diversion of water was stopped, and the water has returned to its previous level, but eruptions continue.