A huge tree-covered island appeared out of nowhere on Canada’s Williston Reservoir in late July, and for a moment, it looked like something straight out of a video game. Boaters spotted the strange floating mass, photos and videos went viral, and B.C. Hydro eventually confirmed through satellite imagery that the bizarre formation was very real.
Then came the next twist: by August 5, the island had vanished from satellite images. It covered roughly 9,800 square metres—about 70 metres wide and 140 metres long—making it larger than a Canadian football field and close to two NFL fields. Now, the big question is not just how it appeared, but where it went.
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Williston Reservoir floating island mystery confirmed by satellite imagery
The mysterious formation was spotted on the Williston Reservoir in northeastern British Columbia, north of Mackenzie and around 100 kilometres west of the W.A.C. Bennett Dam. Created behind the dam in 1968, the reservoir is so enormous that it can be seen from space.
Local boater Rocky Avery received photographs and video of the floating mass and shared them online. The footage quickly spread, with people questioning whether the strange images were even real.
Avery said the sight was unlike anything he had experienced during his 40 years in Canada.
“It was a pretty amazing sight to see, never seen anything like that in my 40 years in this country,” he said.
With a fishing derby approaching, Avery also wanted other boaters and B.C. Hydro to know about the unusual object.
“There was a big fishing derby coming up, so I wanted to make sure everybody was aware of what was going on. And I wanted B.C. Hydro to know too that it was out there, just in case it was floating down their way.”
B.C. Hydro spokesperson Bob Gammer initially had doubts. With modern AI capable of producing convincing fake photos and videos, the utility needed more evidence before treating the sighting as genuine.
“It’s certainly something we’ve not heard of before,” said Gammer. “And with not very many people reporting it, it was difficult to locate.”
That changed when satellite imagery from July 21 showed the object in the main body of the reservoir west of Finlay Bay. The imagery also helped establish its extraordinary size: approximately 70 by 140 metres, covering around 9,800 square metres.
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The giant floating island disappeared from Williston Reservoir
Just when the mystery seemed to be getting clearer, the island disappeared.
B.C. Hydro checked newer satellite imagery and found no sign of the massive formation by August 5.
“We’ve been taking more updated snapshots and we can’t see the object anymore. So it’s disappeared now,” Gammer said.
But disappearing from view does not necessarily mean disappearing underwater.
“It doesn’t mean it’s gone to the bottom of the reservoir. It may have returned to a more sheltered area along the shoreline.”
That possibility has kept B.C. Hydro monitoring the reservoir. The formation appears to have been a floating accumulation of vegetation, woody material and debris rather than an actual geological island.
Online, the bizarre disappearance naturally sent social media into overdrive. Users compared the sight to Lost and Mirage Island from Pokémon Ruby, while others went much further with their theories.
“Billionaires, aliens, or the supernatural. No in between,” one person commented.
“I promise you there’s nothing real about life at this point lol,” another wrote.
“Random island shows up for weeks and no one actually goes to visit it? That’s not odd to anyone else…,” another commenter added.
One user simply posted:
“They done found Mirage Island”
The jokes are wild, but the available evidence points toward something much more natural.
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High water levels could explain the mysterious floating island
The leading explanation currently involves unusually high water levels at Williston Reservoir.
The reservoir has experienced high winter snowpacks and steady summer rainfall, pushing water levels high enough for B.C. Hydro to open the W.A.C. Bennett Dam spillways during June and July. Gammer noted that the reservoir had not been completely full for 14 years.
“We haven’t had a full reservoir in 14 years,” Gammer said. “We can’t pinpoint the origin of this floating island [but that’s] one explanation that seems reasonable.”
The theory is surprisingly straightforward. Over years, driftwood and woody material can collect along the shoreline. Vegetation and trees can then establish themselves within that decomposing material. When water levels rise substantially, a large accumulation can potentially break away and float into the reservoir.
B.C. Hydro documentation also supports the broader process, noting that changing water levels can cause woody debris to become stranded and later refloated. The Williston Reservoir has historically contained significant quantities of floating woody debris.
Avery noticed similar changes around the reservoir, saying unusually high water had washed away shoreline sand dunes previously used for quad-biking and brought more trees and debris into the water.
“There’s areas we would never even drive a boat on before, and now we’re going up over top of it,” said Avery.
So, rather than a mysterious geological island suddenly rising from the reservoir floor, the evidence suggests a gigantic natural debris formation may have been released by changing water conditions. Exactly where it originated, however, remains unknown.
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Could the Williston Reservoir island return?
Floating islands may sound impossible, but they are a documented natural phenomenon. In Wisconsin, sections of peat bog broke away from the bottom of Lake Chippewa after the area was flooded for construction of Winter Dam. One formation, the “Forty Acre Bog,” became so mobile that boats are used to push it back into position each year to stop it drifting toward a local bridge.
Floating islands have also been studied in Lake Victoria in Africa, including their effects on transportation, fisheries and water quality.
That makes the Williston Reservoir discovery unusual rather than inexplicable. Its scale, open-water location and sudden disappearance are what made it so remarkable.
B.C. Hydro says continuously searching the enormous reservoir by boat is impractical, so satellite imagery and public reports remain important. The utility does not expect the floating mass to affect reservoir operations, but it will continue watching for signs of its return.
For boaters, meanwhile, floating debris may pose the bigger immediate danger. Avery warned that trees become difficult to spot when the water gets rough.
“When it’s calm, it’s fine. You can usually see them, but you get a little bit of choppy waves and it’s really hard to see them until you’re right on top,” he said.
“Some are full-size trees and it’ll do a lot of damage to your boat. So you got to be super careful.”
For now, the giant floating island remains missing. It could have sunk, broken apart, become trapped near the shoreline or simply drifted somewhere difficult to observe. B.C. Hydro has not confirmed which happened.
And that leaves one final possibility: the strange island could still come back.
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Disclaimer
This article is based on publicly available reporting and information from CBC News and B.C. Hydro, including the Williston Reservoir Management Plan, reservoir debris-monitoring documentation and water, flows and reservoir information. The precise origin and current location of the floating island have not been conclusively established, so explanations about how it formed or where it went remain informed possibilities rather than confirmed facts.
Sources
- CBC News
- B.C. Hydro — Williston Reservoir Management Plan
- B.C. Hydro — Peace Project Water Use Plan, Williston Reservoir debris monitoring
- B.C. Hydro — Water, flows and reservoirs
Image Credit: Erik Mclean on Pexels
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