(bright music) (gentle music) - If the Columbia River's mouth eluded some of the most seasoned northwest explorers who overlooked it, mistook it for a bay or a rough section of coast, locating the river's headwaters was also a challenge.

Unlike the river's outlet, the Columbia gained its 1,200-mile momentum in the Rocky Mountain Trench between the Rockies and Purcell Ranges in the deep northwest interior of eastern British Columbia.

And oddly, if explorers expected the big river to turn south or west, it confusedly runs north for some 200 miles until it does a tight hairpin turn and begins its long roll to the Pacific.

Looking at a simple map of the river's course, it looks like someone has untwisted a paperclip and left in more than one big bend.

(playful upbeat music) The Sinixt people's traditional lands extend from Kettle Falls and the Colville Reservation in the US to the Columbia's hairpin turn at Mica in the north.

Sinixt storyteller Marilyn James tells of the river's origins.

Coyote once met and fell in love with Rain.

Rain fell for Coyote and ripped out her heart for him, and where her heart landed became the headwaters of the Columbia and the blood that flowed from it was the river.

The river is indeed the region's lifeblood.

Today its headwaters are acknowledged as Columbia Lake, an eight mile long body of relatively shallow water.

When the first white fur traders came over Athabasca Pass from modern-day Alberta just to the north, they built a trading post, Kootenae House, near present-day Invermere, BC.

They essentially set up camp close to what turned out to be the origin of the great river they were looking for, without knowing it.

David Thompson, a Welsh Canadian fur trader and surveyor who led the group in the early 1800s, was sent to explore and survey the unmapped region, exploit its fur-bearing resources, and figure out where the Columbia started and follow it to its mouth.

In 1811, Thompson and his exploring party became the first known Europeans to navigate the Columbia's entire length.

They were the first whites to travel from Kettle Falls later drowned by Grand Coulee Dam's Lake Roosevelt to 1940, to the river's junction with a Snake River near present-day Tri-Cities.

The comparatively placid, damned river we know today was rough going back then with falls and rapids, but Thompson's trip was not only in the service of the fur trade and finding a route to the Pacific, but also of laying claim to the region ahead of competing American colonizers spurred in part by the explorations of Lewis and Clark.

Thompson mapped much of the Columbia's drainage in Western Canada, Idaho, Montana, and Washington.

Reading accounts of Thompson's adventures in the region, one gets the sense of its remoteness and isolation.

Even today, this stretch of mountain ranges, valleys, rivers, lakes, and fjords is complex and beautiful, and still encased in wilderness.

For many Americans, the Columbia River just disappears from thought and view north of the US border, but nearly 400 miles of the river runs through this spectacular country.

(dramatic majestic music) Even for a seasoned adventurer like Thompson, who was often reliant on the aid of local First Nations peoples for survival, the region carried a whiff of the primeval.

(light music) During a trek over Athabasca Pass to the west side of the Rockies, Thompson's party encountered a fresh set of footprints in the snow, which his indigenous companions believe were made by an elephant-like creature that, as tradition had it, lived in the area.

It was said to be about 18 feet high and to sleep standing up, sometimes leaning against trees.

It was not a carnivore but a vegetarian.

Thompson thought the tracks could have been made by an old grizzly bear with worn claws, but had his doubts.

Throughout the 19th century, there were rumors that woolly mammoths might still wander the Northlands.

Author Jack Nisbet, who followed in the footsteps of Thompson for his book "Sources of the River," has written, quote, "It's hard not to be intrigued by the account.

The Whirlpool River drainage does have an ice age look about it, and it has the room, the vast empty spaces that it would take to harbor an outsized relic."

(dramatic music) Indeed, this part of Canada still gives us a look at the era of glaciation that shapes so much of the Pacific Northwest and continues to.

The Columbia starts here with rain, snow, and glacier melt.

The vast Columbia ice field in the Rockies that straddles the continental divide between Alberta and BC, its meltwater eventually feeds into three oceans, the Arctic, the Atlantic, and the Pacific.

You can view it from the Icefield Parkway between Banff and Jasper National Parks.

The mountains here dwarf visitors, even mammoth-sized ones.

One can appreciate its scale by walking on one of the Icefield's big toes, the Athabasca Glacier, at its eastern base.

The Columbia Icefield supplies water to the North Saskatchewan, Athabasca, Fraser, and Columbia Rivers.

It is thought to have formed some 200,000 years ago during the Illinoian Glaciation, which reached as far south as Illinois.

Like many glaciers and ice fields that feed the Columbia, the Icefield is shrinking, so too are British Columbia's glaciers.

Canada's Columbia Basin contributes some 30 to 40% of the river's total runoff from snow and ice.

The future of the northwest freshwater supply, irrigation, fish habitat, and hydropower partly lie here.

A study in the journal "Science" published in 2023 concluded that most glaciers in western Canada will be gone in 80 years due to warming global temperatures Due to drought and decline in snowpack, hydropower production has been down significantly, though demand is rising.

(gentle dramatic music) "Roll on, Columbia" is a phrase that can't be taken for granted.

The generation being born now might be the last to know the river and its headwaters as we have known them.

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