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Why The Heck … Does Wyoming’s Rare Periodic Spring Turn Itself On And Off?

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Why The Heck … Does Wyoming’s Rare Periodic Spring Turn Itself On And Off?


The on-again, off-again stream in Swift Creek Canyon is a rare geological feature located about 5 miles east of Afton, Wyoming. So rare, it is probably one of only a handful in the world.

The natural spring cycles on and off at regular intervals, earning it the name Periodic Spring, or sometimes Intermittent Spring. Folklore often labels the feature “The Spring That Breathes,” and while that moniker sounds Native American-like, there is no evidence supporting First Nation peoples in the Star Valley area ever even knew of it.

What is known is that an ice-cold stream that is 100% drinkable runs down a mountainside one minute and dries up the next.

Thirsty? Fear not. The wait between flows is usually less than 20 minutes.

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Springing To Life

Olympic gold medalist wrestler Rulon Gardner’s great-great-grandfather discovered this phenomenon in August 1894.

While logging up in Swift Creek Canyon just east of Afton, Bruce Gardner found an unnamed spring that fed Spring Creek to be very tasty to a parched logger. The trouble was the spring would be running full bore one minute and dried up the next. Its flows weren’t unreliable, just intermittent.

The spring is known as a “rhythmic spring.” There are reportedly only a handful of these in the world, and Period Spring is supposedly the largest.

The classification of Periodic Spring as a rhythmic spring remains an educated guess. This particular feature in Wyoming is often denoted as an underground cold-water geyser, but that’s not technically correct.

Cold-water geysers are a rare phenomenon known around the world. Germany’s Andernach is the highest spouting and the Herľany Geyser, discovered in 1872 in Slovakia, blows its top only once a day.

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Cold-water geysers are similar to their geothermal counterparts like Old Faithful. The difference is, Old Faithful uses heat generated by a layer of basaltic magma to boil water to the steam-driven point it explodes to the surface.

Sometimes called soda pop geysers, cold-water geysers use underground pockets of CO2 to push water to the surface.

Crystal Geyser just outside of Green River, Utah, is probably the best-known of these. It was accidentally “created” in 1936 when exploratory oil drilling unknowingly tapped into a carbon dioxide-charged aquifer.

The underground nature of Periodic Spring near Afton means you cannot see the eruption spout. But you certainly can hear it as it gurgles in a cave perched atop a heavily-wooded hillside above Swift Creek.

Much like Old Faithful, a period of hissing and wheezing signals flow from the springhead is about to begin. Water then rises to the lip of the underground cistern and eventually spills over. What starts as a trickle is soon a roaring rivulet, cascading its way over moss-covered rocks to its confluence with Swift Creek a quarter mile below.

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For about 15 minutes, all seems normal. A delicious-looking rill bubbles to life looking like it has always been there. Stick around, though. Once the underground reservoir empties out, the flow shuts off, the streambed dries up, and all is still once again for another 15 minutes.

How It Works

“Everything about this spring is somewhat surprising. It’s an extremely unusual occurrence,” said Kip Solomon, a hydrologist at the University of Utah.

Scientists are not 100% sure what makes Periodic Spring do what is does, but they’ve made a fairly safe, educated guess.

Solomon has studied the spring probably more than anyone. He said the closest thing to it in behavior is a similar phenomenon in France.

He shared his best theory on how it works.

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“As groundwater flows continuously into a cavern, it fills a narrow tube that leads out. As it pours over the high point of the tube, it creates a siphon effect, sucking water out of the chamber. Eventually, air rushes in and breaks the siphon,” Solomon assured.

Studies conducted by University of Utah in the mid-2000s confirmed no gas content in the water, strongly suggesting support for the siphon theory.

“We can’t think of another explanation at the moment,” Solomon added.

The best time to view the spring turning itself on and off is from late August through November when the water table is at its lowest and the distinction between flows is at its most distinctive.

A similar rhythmic spring called the Ebbing and Flowing Spring can be found in Hawkins County, Tennessee, near Rogersville. That spring flows for a period of 2 hours and 47 minutes, ranging from an indiscernible trickle to nearly 500 gallons per minute.

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Periodic Spring is very much like an artesian well. The pristine ice-cold water and can be safely consumed right out of the ground. In fact, the Periodic Spring provides part of the water for the town of Afton. That’s the reason for the cement hood placed over the mouth of the spring to prevent rocks and other debris from falling into the opening.

The spring feeds a torrent of water down Swift Creek Canyon to a hydroelectric plant, which supplies surrounding towns with electricity.

Getting There

Locate Second Avenue in Afton, then head east out of town. The road is paved for a mile or so and then turns into a well-maintained dirt road (FR 10211) for another 4 miles. On the way, you will notice a drinking water tank maintained by the town of Afton.

The road ends about 5 miles outside of town at a parking area. You can’t miss the beginning of the trail at the far end. You are now in the Bridger-Teton National Forest, by the way.

The walk is only three-quarters of a mile on relatively flat terrain. To get to the spring, cross the Swift Canyon Creek to an area with a highly visible sign and a picnic table.

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Want a close-up look at where the wellhead is? Begin the trek up along the left side of the rocky rill. Be extra cautious — the rocks near the top will be extremely slippery.

The whole area is refreshingly low-key and un-sensationalized. It is a wonder of nature, both remarkable and rare. Enjoy the serenity, tread lightly, and leave no trace.

Contact Jake Nichols at jake@cowboystatedaily.com

Other Stories In Cowboy State Daily’s What The Heck … Series:

What The Heck … Are Snow Squalls, And Where Do They Come From?

Why Is There A Bike On Top Of The Historic Lander Grain Elevator?

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What The Heck … Is That Pile Of Teddy Bears In The Middle Of Nowhere Near Kemmerer?

What The Heck … Is Up With That Gillette House You Can Practically See From Space?

What The Heck Is … Ayres Natural Bridge, A Rare Wonder Everyone Drives By On I-25?

Who The Heck … Decorates That Tree In The Middle Of Nowhere North Of Sheridan?

Why The Heck … Does Green River, Wyoming, Have An Intergalactic Spaceport?

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What The Heck … Is That Apocalyptic Ruined City On The Way To Yellowstone?

What The Heck … Is That 400-Foot Snaggle Tooth Rock North Of Rock Springs?

What The Heck … Is That Giant Mineral Dome In Thermopolis?

Why The Heck … Is A Camel The Mascot For A Wyoming High School?

What The Heck Is … That Old Stagecoach Stop Off I-80 Near Green River?

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What The Heck Is … That Airplane On A 70-Foot Pole Along I-90 In Wyoming?

What The Heck Is … That 30-Foot Virgin Mary Statue On I-80 At The Nebraska Border?

What The Heck … Is That Giant Face On The Hill Overlooking Green River?

What The Heck Is … That 60-Foot Pyramid In the Middle Of Nowhere Off I-80?

What The Heck Is … The Vore Buffalo Jump Along I-90 In Northeast Wyoming?

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What The Heck Is … With Betty Boop, Big Boy And That Sinclair Dinosaur North Of Cheyenne?

What The Heck Is … That Giant Abraham Lincoln Head Overlooking I-80 At The Top Of Sherman Hill?

What The Heck Is … That Lonely Grave On A Hill Overlooking Interstate 80?

What the heck is … That Lonely Tree Growing Out Of A Rock In The Middle Of I-80?

What The Heck Is … That Lonely Big Boy Statue In the Middle Of A Field In Wapiti, Wyoming?

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What The Heck Is … That Giant 13.5-Foot-Tall Head On A Corner In Laramie, Wyoming?

Jake Nichols can be reached at jake@cowboystatedaily.com.



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University Of Wyoming Budget Spared (For Now), Biz Council Reined In

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University Of Wyoming Budget Spared (For Now), Biz Council Reined In


If the Wyoming House and Senate approve its budget changes, then the chambers’ Joint Conference Committee will have helped the University of Wyoming dodge a $40 million cut, while also limiting the Wyoming Business Council to one year’s funding instead of the standard two. 

The Joint Conference Committee adopted numerous changes to the state’s two-year budget draft, but didn’t formally advance the document to the House and Senate chambers. The committee meets again Monday and may do so at that time.

Then, the House and Senate can vote on whether to adopt that draft by a simple majority.

First, UW

Starting in January, the Joint Appropriations Committee majority had sought to deny around $20 million in exception requests the University of Wyoming made, while imposing a $40 million cut to the university’s block grant.

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That’s about 10% of the state’s grant to UW but a lesser proportion of the school’s overall operating budget.

The Senate sought to restore the $60 million.

The House sought to keep the denials and cuts, ultimately settling on a bargain to cut $20 million, and hinge UW’s retention of the remaining $20 million on its finding and reporting $5 million in savings.

The Joint Conference Committee the House and Senate sent into a Friday meeting to negotiate those two stances chose to fund UW “fully,” Senate Majority Floor Leader Tara Nethercott, R-Cheyenne, told Cowboy State Daily in the state Capitol after the meeting. 

But, $10 million of UW’s $40 million block grant won’t reach it until the school charts a “road map” of how it could save $5 million, and reports that to the Joint Appropriations Committee, she added. 

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“A healthy exercise, I think, for them to participate in, while the Legislature still allows them to receive full grant funding,” Nethercott said. 

“I’m hopeful people feel confident the University is fully funded,” she continued, as it’s “on the brink of receiving a new president, having the resources he or she may need to continue to steer the leadership of the University, our state’s flagship school into the future.”

Hours earlier in a press conference, House Speaker Chip Neiman, R-Hulett, said the Legislature has been clear that UW should avoid “diversity, equity, and inclusion” or DEI programming, and that it’s the position of the House majority that the school should tailor its programming to Wyoming’s true business needs – so UW graduates will stay in the state.

Within an earlier draft of the budget sat a footnote blocking money for Wyoming Public Media — a publicly funded media and radio entity funded through UW’s budget.

That footnote is gone from the JCC’s draft, said Nethercott. 

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Wyoming Business Council

The Wyoming Business Council is set to receive roughly $14 million, confined to one year, for its internal operations, said Nethercott. 

“Both chambers have decided to only fund the operations,” Nethercott said, “not all the grant programs.” 

She said that’s to compel the Legislature to revisit the concerns it has with the agency, then return in the 2027 legislative session with a vision for its future. 

The Business Ready Communities program is “eliminated,” she said. 

JCC member Rep. Ken Pendergraft, R-Sheridan, elaborated further. 

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Of the appropriation, $12 million is from the state’s checking account, plus the state is authorizing WBC to use $157,787 in federal funds and nearly $1 million from other sources. 

“We’re going to take it up as an interim topic in appropriations (committee) and how to rebuild it and make it work the way we think it should work,” said Pendergraft. But the JCC opted to fund the Small Business Development Center for two years, along with Economic Diversification Division for Manufacturing Works, and the Wyoming Women’s Business Center, Pendergraft noted, pointing to that language on his draft budget sheet. 

Pendergraft made headlines last year by saying he wanted to eliminate the Wyoming Business Council altogether. 

But Nethercott told the Senate earlier this month, legislators have complained of that agency her entire nine-year tenure. 

She attributed this to what she called communications shortfalls that may not be intentional. She cosponsored a now-stalled bill this year that had sought to adopt a task force to evaluate WBC. 

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The Wyoming Business Council’s functions range from less controversial, like helping communities build infrastructure, to more controversial, like awarding tax-funded grants to certain businesses on a competitive application process. 

Wyoming Public Television

Wyoming Public Television, which is not the same as Wyoming Public Media, is slated to receive the $3 million it lost when Congress defunded the Corporation for Public Broadcasting, Nethercott said. 

It will also receive its usual $3 million from Wyoming. 

The entity will not receive another $3 million it had sought to upgrade its emergency-alert towers, said Nethercott, “because we received information from them… they have another source to pay for the replacement and maintenance of the towers.” 

Like the Wyoming Business Council, the Wyoming Public TV’s functions range from less controversial to more controversial.

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The entity operates, maintains and staffs emergency alert towers throughout Wyoming. 

Wyoming Public TV also produces entertainment and informational movies. Its state grants run through the community colleges’ budget. 

State Employees

Nethercott noted that the JCC advanced to both chambers an agreement to pay $111 million from the state’s checking account to give state employees raises.

Those raises would bring them to 2024 market values for their work, she noted. 

Because that money is coming from the state’s checking account, or “general fund,” and not its severance tax pool as the House had envisioned, then $111 million won’t impact the $105 million investment another still-viable bill seeking to build an “energy dominance fund” envisions. 

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That bill, sponsored by Senate President Bo Biteman, R-Ranchester, seeks to lend to large energy-sector projects. 

Biteman told Cowboy State Daily in an interview days before the session convened that its purpose is to counteract “green” compacts investors have adopted, and which have bottlenecked energy projects.

Wyoming’s executive branch is currently suing BlackRock and other investors on that same assertion. 

Clair McFarland can be reached at clair@cowboystatedaily.com.



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Casper veteran David Giralt joins race for Wyoming U.S. House seat

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Casper veteran David Giralt joins race for Wyoming U.S. House seat


CASPER, Wyo. — David Giralt, a Casper-raised military veteran and conservative Republican, has announced his candidacy for Wyoming’s lone seat in the U.S. House of Representatives. The congressional seat is being vacated by Republican Rep. Harriet Hageman, who launched a campaign in December for the U.S. Senate seat currently held by retiring Sen. Cynthia Lummis. […]



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Rivalries and Playoff Positioning Highlight Week 11 Wyoming Girls Basketball Slate

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Rivalries and Playoff Positioning Highlight Week 11 Wyoming Girls Basketball Slate


It’s Week 11 in the 2026 Wyoming prep girls’ basketball season. That means it’s the end of the regular season. 3A and 4A schools have their final game or games to determine seeding before the regional tournament, or if a team is locked into a position, one last chance to fine-tune before the postseason. Games are spread across four days.

WYOPREPS WEEK 11 GIRLS BASKETBALL SCHEDULE 2026

Every game on the slate is a conference matchup. Several rivalry contests are part of this week’s schedule, such as East against Central, Cody at Powell, Lyman hosting Mountain View, and Rock Springs at Green River, just to name a few. Here is the Week 11 schedule of varsity games WyoPreps has. All schedules are subject to change. If you see a game missing, please email david@wyopreps.com.

CLASS 4A

Final Score: Laramie 68 Cheyenne South 27 (conference game)

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CLASS 3A

Final Score: Lyman 40 Mountain View 26 (conference game)

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CLASS 4A

Final Score: Evanston 41 Riverton 39 (conference game)

Final Score: Natrona County 42 Kelly Walsh 38 (conference game) – Peach Basket Classic

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Final Score: #4 Thunder Basin 64 Campbell County 32 (conference game)

CLASS 3A

Final Score: #1 Cody 77 Worland 33 (conference game) – 5 different Fillies with a 3, and Hays led the way with 34 points.

Final Score: #2 Lander 49 Lyman 34 (conference game)

Final Score: #4 Wheatland 51 Douglas 40 (conference game)

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Final Score: #5 Powell 48 Lovell 42 (conference game)

Final Score: Burns 56 Torrington 43 (conference game)

Final Score: Glenrock 78 Newcastle 30 (conference game)

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Read More Girls Basketball News from WyoPreps

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WyoPreps Girls Basketball Week 9 Scores 2026

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WyoPreps Girls Basketball Week 1 Scores 2025-26

 

CLASS 4A

Rock Springs at #2 Green River, 5:30 p.m. (conference game)

#4 Thunder Basin at #5 Sheridan, 5:30 p.m. (conference game)

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#1 Cheyenne East at #3 Cheyenne Central, 6 p.m. (conference game)

Jackson at Star Valley, 6 p.m. (conference game)

CLASS 3A

#3 Pinedale at Mountain View, 4 p.m. (conference game)

#1 Cody at #5 Powell, 5:30 p.m. (conference game)

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Buffalo at Glenrock, 5:30 p.m. (conference game)

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CLASS 3A

Newcastle at Buffalo, 12:30 p.m. (conference game)

Glenrock at Rawlins, 3 p.m. (conference game)

Torrington at #4 Wheatland, 5:30 p.m. (conference game)

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Submit a Score to WyoPreps

 

Wyoming Boys 4A Swimming & Diving State Championships 2026

4A Boys State Swim Meet for 2026 in Cheyenne

Gallery Credit: David Settle, WyoPreps.com





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