Now you see it, now you don’t! There’s a beautiful river that makes its presence known as it flows through the great state of Wyoming. That is until it performs a vanishing act of sorts. One minute it’s there, and the next minute, the earth has completely swallowed it up. Most people don’t realize this river in Wyoming flows underground…or does it?

This road isn't the only thing that meanders through this state park in Wyoming.
dayvayen/Wikipedia
Located in the Wind River Mountains, six miles southwest of Lander along Wyoming Highway 131, is Sinks Canyon State Park. Sinks Canyon State Park is named for the Middle Fork Popo Agie River. This very special river is the heart and soul of the park.
3Jomommy/TripAdvisor
This unusual body of water is 54 miles long, and flows around any obstacle that dares try to stand in its way. The water flows just like any other river until:
...it flows into an underground limestone cavern, where it completely disappears.
3Jomommy/TripAdvisor
This is where the limestone begins to work its magic on the unsuspecting waters of the river.
Brian Harms/Wikimedia
The limestone formation was formed by glacial movement during the Ice Age. This, in turn, created extensive underground fissures and high canyon walls throughout the park.

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Brian Harms/Wikimedia
The rushing river flows into this underground limestone cavern through cracks and fissures in the rock. This section of the river is known as "The Sinks".
Brian Harms/Wikimedia
The amount of water flowing into "The Sinks" varies throughout the year. The water flow depends on the time of year and the amount and form of precipitation.
Maria R./TripAdvisor
The water level drops in the winter and swells dramatically in late May and early June during spring runoff from the melting snow. What should only take minutes transforms into hours; it takes over two hours for the water to travel underground for 1/4 mile on its unusual journey.
Uwe R./TripAdvisor
It is believed that there are many winding underground passages that the water has to work its way through.
Brian Harms/Wikipedia
The Popo Agie River eventually emerges by trickling out of the hillside into a protected trout pool called 'The Rise' before it continues on its path down the canyon.

This is an amazing feat for such an ordinary Wyoming river!

For another unusual Wyoming river, check out The Most Unique River In The World Is Right Here In Wyoming. What do you think? What are your favorite rivers in beautiful Wyoming?

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Underground River In Wyoming

Tori Jane | June 03, 2021

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Where can I find some hidden natural gems in Wyoming?

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What are some unique sites in Wyoming to explore?

Wyoming is home to lots of weird, wonderful, and unique places to learn about and explore. Wyoming is a nature lover’s dream state; hot springs, geysers, and other uncommon natural phenomena are everywhere - you just need to know where to look! For example, while everyone is crowded around Old Faithful, we recommend you check out lesser-known places of interest in Yellowstone National Park, like the Morning Glory Pool. The Grand Prismatic Spring is also super intriguing. Outside of Yellowstone, there’s also the old Hole-In-The-Wall Outlaw Hideout, where you can hang out right where old-school outlaws did once upon a time. Get out and explore; Wyoming is incredible. 

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Sinks Canyon, Wyoming 82520, USA