How the Valley Was Formed

Before 36,000 Years Ago, this land sat through the Olympia Interglaciation, a long ice-free period during which the valley — though unrecognizable compared to today — already existed as open ground.

25,000 Years Ago, cooling temperatures triggered the Evans Creek Stade, as alpine glaciers began forming across the surrounding mountains. Ice from the Coast Mountains kept building until it merged into the Cordilleran Ice Sheet, which entered the region and began burying the landscape entirely.

22,000 Years Ago, ice from the Fraser Glaciation reached the mouth of the valley and dammed it completely, creating a glacial lake. That lake's fine silt sediments, still visible today up to 200 metres above sea level, remain some of the clearest physical evidence of how deep this ice age ran here.

21,000 to 18,500 Years Ago, the valley lived through the Vashon Stade, the coldest and most extensive phase of the Fraser Glaciation, entombed under thousands of feet of moving ice with no rivers, lakes, or forests visible at all.

13,500 Years Ago, even as the broader retreat continued, a renewed advance called the Sumas Stade pushed a lobe of ice back into the lower valley, building an end moraine — one last glacial push before the ice truly began losing its grip.

11,900 to 11,200 Years Ago, two further minor re-advances occurred, separated by a brief warm spell in which volcanic ash settled and a young coniferous forest briefly took root. The clearest surviving evidence sits at the Tamihi Slide and along Slesse Creek — both places you can visit today — where layered sediment and organic material have been radiocarbon-dated to this exact window.

11,300 Years Ago, the retreat became real and lasting. Forests took hold in the lower valley, soil began to form, and the Chilliwack River Valley as a living landscape — the one whose rivers, lakes, and mountains still shape everything that happens here — had finally arrived.

The First Peoples

10,000+ Years Ago, human beings were already here, not long after the ice had gone. Archaeological evidence places people in the Fraser Valley, including this exact valley, at this depth of time — the ancestors of the Ts'elxwéyeqw (Ch-ihl-kway-uhk).

Since Time Immemorial, this has been Stó:lō territory — the Halq'eméylem-speaking "People of the River," part of the broader Coast Salish peoples. To the Stó:lō, this land is S'ólh Téméxw, "Our Land" or "Our World," and the name "Chilliwack" itself is an anglicization of Ts'elxwéyeqw, most commonly translated as "going back upstream, as far as you can go in a canoe" — a description of this exact river.

Pre-Contact Era, the earliest known Ts'elxwéyeqw villages clustered around Chilliwack Lake (Sx̱ótsaqel), "sacred lake," at the head of the valley, before communities gradually moved downriver over many generations. Archaeologists have documented real sites throughout this process — Iy'oythel, a pithouse (sqémél) settlement in the lower valley recorded as site DgRk-10, with roof entrances 3 to 7 metres above the floor, distinct even from neighbouring Stó:lō and Interior Salish building styles; and Qoqolaxel, an inverted-gable "Watery Eaves" longhouse at the junction of the Chilliwack and Fraser Rivers, later reconstructed as a scale model by Stó:lō carver Bob Joe.

Pre-Contact Era, these communities were never isolated. Archaeological research shows trade and cultural connections reaching as far as eastern Oregon — this valley was linked to a much wider world long before any map of it existed.

Since Time Immemorial, the landscape itself has carried these stories. Slesse Mountain (Selísi), "fang," is said to have been shaped by Xexá:ls, the Transformers, ancestral beings who travelled the land making things right. Chilliwack Lake is home, in Stó:lō teaching, to S'o:lmexw, spiritual beings known as the Water Babies. These accounts survive as sxwōxwiyám, teaching stories of the distant past, and sqwélqwel, true personal and family histories — the two oral traditions that carried this history for thousands of years before written language ever arrived here.

Colonial Settlement

1782, decades before any settler physically arrived in the valley, European contact had already begun affecting it — smallpox, introduced from a distance, swept through Stó:lō communities and reduced the population by an estimated 90 to 95 percent, from a pre-contact population thought to number between 40,000 and 60,000.

1808 to 1827, the first direct European presence in the wider region arrived. Simon Fraser became the first European to travel most of the river that now bears his name in 1808, and in 1827 the Hudson's Bay Company established Fort Langley downstream, opening the fur trade that would eventually draw settlers this far up the valley.

1855, the Hudson's Bay Company cut the first recorded European trail up the Chilliwack River — not from nothing, but as an improvement to an existing Indigenous trail that had already connected nine villages between Vedder Crossing and Chilliwack Lake for generations.

1858, everything changed. The Fraser Canyon Gold Rush brought an estimated 30,000 gold seekers flooding through the Lower Mainland, most arriving by steamship up the Fraser River. That same period, Sir James Douglas, Governor of the Colony of British Columbia, began establishing Indian Reserves throughout the region.

Early 1860s, when the gold rush subsided, many who'd come for gold stayed to farm. Jonathon Reece, John Lawrence, William Teague, and brothers Isaac and James Kipp pre-empted land on Chilliwack Prairie. Around the same years, Volkert Vedder — born in Schenectady, New York in 1808, and a California gold-seeker himself back in 1851 — settled with his sons Adam and Albert on the south side of Chilliwack; his name would eventually attach itself to Vedder Crossing, Vedder Road, Vedder Canal, and the Vedder River itself. Nearby, A.C. Wells, Adam Vedder, and Jane Evans became the first known farmers at what would become Sardis, a name chosen by Mrs. Vedder after the ancient city in present-day Turkey.

1859 to 1885, some of the earliest settler families were bound directly into the Stó:lō community through marriage. James Bertrand married Mary Ann John in 1859, sister of local Stó:lō chief Captain John. William Prest, born in Yorkshire in 1844, married Mary "Tata" Benn of what is now Sqwah First Nation; by 1885 the Prest family had pre-empted land on Little Mountain, and Prest Road — still a major Chilliwack route today — carries their name.

1873 to 1908, Chilliwack became a formal municipality. The Township of "Chilliwhack" was incorporated in 1873, the third-oldest municipality in British Columbia, and the City of Chilliwack incorporated separately in 1908 — the two would later merge into the District of Chilliwack in 1980, becoming the City of Chilliwack once more in 1999.

1875 to 1894, the valley's own geography quite literally rearranged itself. A logjam in 1875 diverted part of the Chilliwack River into a smaller channel called Vedder Creek; a second, deliberately engineered logjam in 1882 pushed more water the same way; and a major freshet in 1894 — compounding the devastating Fraser Valley flood of that same year — made the new course permanent. That diverted channel is why, to this day, the river is called the Chilliwack River above Vedder Crossing and the Vedder River below it.

1876, the Indian Act formally restructured Stó:lō governance. The once unified, territory-based Ts'elxwéyeqw people were divided into seven distinct band communities — Ăthelets, Sq'ewqéyl, Shxwhá:y, Th'ewá:lí, Sxwoyehálá, Ch'íyáqtel, and Yeqwyeqwí:ws — the same seven communities that make up the Ts'elxwéyeqw Tribe today.

Twentieth Century

1909 to 1927, Vedder Crossing grew from a small settlement of fishermen, hunters, and campers into a working community, anchored by a logging camp founded in 1927 — around the same years railroad logging was expanding rapidly through the valley's forested slopes.

1920s, the Vedder Canal was engineered specifically to drain Sumas Lake, transforming it into what is now Sumas Prairie — one of the most significant feats of land engineering in the valley's history.

1938, a rail accident sparked a massive fire that destroyed the logging railroad entirely, forcing a permanent shift to truck-based logging.

1941 to 1942, Camp Chilliwack was established near Vedder Crossing, later becoming CFB Chilliwack, a major Canadian Army training facility that would operate for over half a century. Rifle ranges were built along the road to Chilliwack Lake, and a visiting company of British military engineers constructed Sapper's Park at the south end of the lake — a name still in use today.

December 9, 1956, the valley became the site of one of the deadliest air disasters in Canadian history. Trans-Canada Air Lines Flight 810, en route from Vancouver to Calgary, reported an engine fire and turned back — but never arrived. All 62 people aboard, including five professional Canadian football players, were killed when the aircraft struck Mount Slesse.

May 1957, after a five-month search, mountaineer Elfrida Pigou and two fellow climbers discovered the wreckage high on Slesse's remote slopes. A granite memorial bearing all 62 names now stands along the forest road beneath the mountain, and in 1995 the site was formally protected as a Heritage Wreck Site.

Late 1950s, the scale of the Flight 810 search revealed the need for a dedicated, trained rescue organization — leading directly to the formation of the Chilliwack Emergency Rescue Corps, the direct ancestor of today's Chilliwack Search and Rescue.

1927 and 1963, Slesse's reputation among climbers grew alongside its history. First climbed in 1927, its Northeast Buttress route was pioneered in 1963 by legendary mountaineer Fred Beckey with Steve Marks and Eric Bjornstad — later included in Fifty Classic Climbs of North America, cementing Slesse's status as a genuine bucket-list ascent worldwide.

The Modern Valley

1961, Chilliwack River Park was established as a Class 'A' Provincial Park — a modest 26-hectare beginning to a much larger protected system to come.

1973, Chilliwack Lake Provincial Park was officially established at the head of the valley, initially protecting 160 hectares around the lake's north end.

1970s to 2000s, the park expanded dramatically, eventually protecting over 9,000 hectares and formally incorporating the backcountry areas around Lindeman, Greendrop, Flora, and Radium Lakes — the same trails guided hikers walk today.

Today, park management is explicitly shared with Indigenous knowledge-holders. Provincial management plans for Chilliwack Lake Provincial Park call for direct consultation with the Stó:lō and Nlaka'pamux First Nations on cultural features, archaeological sites, and traditional stewardship — a formal, ongoing acknowledgment that this land was never simply "discovered."

2001 to 2018, Ts'elxwéyeqw history began being told, deliberately and publicly, by the Ts'elxwéyeqw people themselves — starting with A Stó:lō-Coast Salish Historical Atlas (2001) by Keith Carlson, David Schaepe, Albert McHalsie, and others, and culminating in Being Ts'elxwéyeqw: First Peoples' Voices and History from the Chilliwack-Fraser Valley (2018), a direct continuation of sxwōxwiyám and sqwélqwel oral tradition into the written record, on the Tribe's own terms.

Today, the valley lives at the intersection of all of this history — glacial sediment still exposed in its riverbanks, Ts'elxwéyeqw stewardship actively practiced and increasingly recognized, a settler river-naming quirk still visible on every road sign, a mountainside memorial to 62 lives lost, and a provincial park system built on land logged, farmed, and diverted for over 160 years. It's not a simple history, and it isn't finished being written.

This exclusive historical overview is compiled and maintained exclusively on ChilliwackRiverValley.com, for anyone who visits this valley and wants to understand it in as much depth as possible — the kind of context that turns a hike or a retreat here into a genuinely meaningful and educational experience, one that reaches across space and time rather than stopping at the trailhead.

Much of this history — particularly Ts'elxwéyeqw and Stó:lō history — has been carried for thousands of years primarily through oral tradition, not written record, and continues to be told and refined by the people who hold it. Because of that, this page is meant to be a living document, not a finished one. If you notice an error, know a detail we've missed, or have a correction or addition to offer — especially from Ts'elxwéyeqw or Stó:lō knowledge-holders — please email us. We'll always take the time to listen and update this page accordingly.