Whoops! Yellowstone geologists pull 300 hats from hot springs


Geologists at Yellowstone National Park have pulled more than 300 hats from its picturesque hot springs this year, including a baseball cap labeled with the phrase โ€œI PEE IN THE LAKE.โ€

The wide-brimmed sun hats, visors, and Dad and trucker hats left by some of the western parkโ€™s more than four million annual visitors are estimated to be worth a total of more than $6,000.

โ€œThis immense amount of visitor traffic combines with the areaโ€™s intense winds to create a near-constant stream of trash and hats that blow into delicate hydrothermal areas,โ€ the U.S. Geological Survey said in a statement alongside a photo of the hats.

But while the lost hats may only be worth a few thousand dollars, the damage they often cost the Montana and Wyoming hot springs can be irreversible, the scientists cautioned.

For example, they can change the color and temperature of hot springs or alter or stop eruptions entirely. However, the Ear Spring hot spring was able to erupt in 2018 while clogged with decades of human garbage.

Yellowstone geologists have collected these and hundreds of other hats from sensitive thermal areas throughout the national park this year

Yellowstone geologists have collected these and hundreds of other hats from sensitive thermal areas throughout the national park this year (National Park Service photo by Margery Price)

The Morning Glory pool hot spring โ€” one of 10,000 other active hydrothermal features located near the internationally famous geyser Old Faithful โ€” used to be a stunning crystal blue color before people started throwing coins, handkerchiefs and other objects in it a century ago. The litter has since turned the pool a rich emerald hue, and the debris thatโ€™s embedded in the spring has reduced the waterโ€™s circulation and temperature.

Even after draining the pool in the 1970s, rangers could not reverse the change.

โ€œThere is a chance that Morning Glory Pool will not ever appear in its clear blue state again,โ€ the National Park Service said.

Morning Glory Pool used to be blue until pennies and other debris turned it green

Morning Glory Pool used to be blue until pennies and other debris turned it green (NPS / Jim Peaco)

Cleaning the hot springs provides its own challenges. It is both labor intensive and dangerous for Yellowstone teams, because the debris is โ€œliterally floating in boiling water.โ€ They sometimes need 30-footlong grabber poles to be able to remove items safely.

The crew has collected more than 13,000 pieces of trash and 4,000 rocks and sticks from hydrothermal areas since January.

And theyโ€™ve also found items wackier than hats and trash, driving across more than 11,000 miles across the park.

Yellowstone geologist Mara Reed uses a long grabber pole to remove a park map from the parkโ€™s Mammoth Hot Springs

Yellowstone geologist Mara Reed uses a long grabber pole to remove a park map from the parkโ€™s Mammoth Hot Springs (National Park Service photo by Samantha Hilburn)

This summer, they retrieved a single Birkenstock sandal, a pizza box with slices still inside, a stuffed koala toy, and a Polaroid picture of Excelsior Geyser โ€” which was found within the geyser itself.

After retrieving these items, the geologists have a warning they hope visitors will heed for the rest of the year.

โ€œWhen you visit the park, hold on tight to your hats, stay on marked boardwalks and trails, and make sure all your trash (even the food!) ends up in a trash can,โ€ they said.

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