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Tuesday, October 27, 2020  Spokane, Washington  Est. May 19, 1883
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Sports >  Outdoors

Why the water tastes funny: Poop taints Beartooth lakes, streams

Elk Lake in the Beartooth Mountains is pictured in August 2018. (CHASE DOAK / COURTESY/The Billings Gazette)
Elk Lake in the Beartooth Mountains is pictured in August 2018. (CHASE DOAK / COURTESY/The Billings Gazette)
By Brett French The Billings Gazette

BILLLINGS – Hiking to 21 lakes in the Beartooth Mountains was a fun way for Dan Pendergraph to spend last summer, but the trips had a disheartening downside.

Pendergraph was looking for indications that human feces had contaminated the water in popular areas. Those included the Froze to Death Plateau near Granite Peak, the state’s highest mountain at 12,807 feet. He also visited lakes along the Beaten Path, a trail up the East Rosebud Creek drainage, and the Lake Fork Rock Creek drainage.

The hikes were part of his University of Montana graduate thesis, which proved to be revealing. Out of the 21 lakes and two snowmelt sites, both on Froze to Death Plateau, water samples from 11 tested positive for E. coli contamination. The bacteria is commonly found in the gut of humans and animals where it helps with digestion.

Once outside the gut, though, the bacteria can be nasty. According to the Forest Service the “bacteria and viruses found in human feces are known to cause hepatitis, salmonella, giardia and other gastrointestinal diseases.”


After the 11 E. coli positive hits, Pendergraph and his assistant hiked back to most of those waters and four new waters that might be contaminated to take samples to determine what might be the cause: human or animal. Out of the tests, seven of 15 were positive for human contamination.

“A number of the lakes that tested positive for human contamination were along the Beaten Path,” Pendergraph said. “… Elk Lake was easiest to determine human contamination because we had positive hits in all of our triplicate samples.”

Triplicate refers to three distinct samples used to compare variability in each water.

Waters that tested positive for E. coli registered from 1 to more than 200 colony forming units, or cfu, per 100 milliliters of water. Once in the water, E. coli can persist for months, Pendergraph said.

“Over 200 is alarming, but any detectable levels could be considered hazardous.”

Water samples from Lost Lake, along the Lake Fork Rock Creek trail, ranged from 15 to 200 cfu of E. coli/100mL of water, so even in the same lake different samples showed distinct contamination levels.


Fecal contamination of popular high mountain lakes didn’t surprise officials at the Beartooth Ranger District in Red Lodge who worked with Pendergraph to test certain busy sites.

“It’s always been a concern,” said Jeff Gildehaus, outdoors recreational planner.

Wilderness rangers often spend a large part of their patrol days burying human feces, he said.

“It’s almost like a full-time job. That’s a sad commentary,” he said.

Backcountry regulations and the Leave No Trace ethic recommend waste be disposed in 6- to 8-inch deep “cat holes” at least 200 feet away from water sources in inconspicuous places where others aren’t likely to congregate or camp. Unfortunately, not everyone is aware or follows the rules.

Why a guide

Since 2014, Austin Hart of Beartooth Mountain Guides has required his clients to use a WAG Bag for their waste during guided trips to Granite Peak.

After defecating in the plastic bags, they are double sealed and carried out for disposal. That helps reduce contamination in the rocky Froze to Death Plateau where climbers often camp.

“The amount of human waste up there is definitely noticeable,” he said.

Sometimes toilet paper protrudes from under rocks. In other spots, campers didn’t even try to bury their waste, he said.

“It’s really sad,” Hart said. “Some don’t know any better, but some just don’t care.”

There are now at least two commercial products directed specifically at packing out poop. WAG (waste alleviation gelling) Bags are manufactured in Belgrade, Montana, by Cleanwaste, formerly Phillips Environmental Products. Restop bags are similar, using heavy outer bags that are touted to trap more of the smell. The bags – which are good for more than one use – cost less than $3.

Hart uses WAG Bags on his trips. “They don’t stink too bad,” he said. Hart said suffering through the stench is part of being a good steward of wild places. His company warns clients about what to expect, but some of them are still taken aback by the odd potty routine.

Pack it out

Human waste has long been a problem in other popular backcountry areas.

Washington’s Mount Rainier started requiring hikers, campers and climbers to pack out their poop in the 1980s by mandating the use of “blue bags.” Other high mountain routes, like California’s Mount Shasta and Alaska’s Denali, eventually followed suit because finding a place to dig a cat hole in such terrain was next to impossible. In 2006, Mount Whitney in California’s Inyo National Forest began requiring visitors to pack out their waste, an amount estimated at 7,000 to 8,000 pounds a year.

On average, a human produces 1 to 2 pounds of waste a day.

Filter water

Pendergraph’s study emphasizes the importance of filtering water while backpacking or hiking.

“We’re pulling water from little tarn lakes where there’s a high chance for contamination,” Hart said of the Froze to Death Plateau.

Using a water filter or purifier removes dangerous bacteria like E. coli, giardia and cryptosporidium, which can make people seriously ill. Prior to the popularity of filters, hikers were advised to boil water for up to 3 minutes to kill dangerous bacteria, but that requires a lot of stove fuel or a campfire.

Even waste buried correctly may contaminate water supplies, because mountain soils are often porous and snowmelt runoff can be heavy.

Years ago, a Montana State University study in the Bridger Mountains indicated that test samples buried at different elevations still contained significant amounts of bacteria even after a year in the harsh climate.

“That’s plenty of time for groundwater or surface water to move it through the catchment,” Pendergraph said.

Hiking summer

Because the water test samples had to be back to the laboratory in Bozeman within 24 to 48 hours, all while being kept on ice, Pendergraph and his intern didn’t have any time to hang out after collecting the lake and stream water.

The duo would camp at the trailhead and then “run up” to get samples, preferably from more than one source.

“We were hiking a lot, burning a lot of gas and eating a lot of gas station food,” Pendergraph said.

But it was all worth it to get to spend part of his summer exploring a popular portion of the Beartooth Mountains.

“I was happy to detect poop so I could go back in,” he said.

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