It Would Take About 90 Eruptions for Old Faithful Geyser to Fill an Olympic-Size Pool

For The First Time, Study Shows How Much Water Old Faithful Spews When It Erupts

How much water erupts out of Old Faithful in Yellowstone National Park? For the first time, we actually know. A team of scientists have accurately determined the water output of the world’s most famous geyser for the first time.

It would take about 90 eruptions for Old Faithful Geyser to fill an Olympic-size pool

In a recent study, scientists measured the volume of water erupted from Old Faithful. The average from 45 eruptions was 7,370 gallons but varied from 3,223 to 11,703 gallons.

Old Faithful's Water Output Has Finally Been Measured. And It Would Fill A Lot of Bathtubs

The iconic Yellowstone geyser pumps out an average of nearly 28 cubic meters of water per eruption – but pinning that number down was harder than you might think.