Excelsior Geyser
[4] The Excelsior Geyser pool discharges 4,000 to 4,500 gallons (15,100–17,000 L)[5] of 199 °F (93 °C)[3] water per minute directly into the Firehole River.In the late 19th century (and possibly 1901), it was an active geyser that erupted frequently.It was initially reported in 1869 as a large crater with a pool that had evidence of eruptions but none were seen until 1881 at which point, the geyser became active again.The eruptions of this period were described by Yellowstone superintendent Philetus Norris[6] as: "...simply incredible, elevating to heights of 100 to 300 feet, sufficient water to render the Fire Hole River, nearly 100 yards wide, [into] a foaming torrent of steaming hot water, and hurling rocks of from one to 100 pounds in weight, like those from an exploded mine, over surrounding acres.It is believed that the powerful eruptions had broken off sections of stone that had damaged its internal plumbing system.