Fraser Valley

The Fraser Valley is a geographical region in southwestern British Columbia, Canada and northwestern Washington State. It starts just west of Hope in a narrow valley encompassing the Fraser River and ends at the Pacific Ocean stretching from the North Shore Mountains, opposite the city of Vancouver BC, to just south of Bellingham, Washington.

In casual usage it typically describes the Fraser River basin downstream of the Fraser Canyon. The term is sometimes used outside British Columbia to refer to the entire Fraser River sections including the Fraser Canyon and up from there to its headwaters, but in general British Columbian usage the term refers to the stretch of Lower Mainland west of the Coquihalla River mouth at the inland town of Hope, and includes all of the Canadian portion of the Fraser Lowland as well as the valleys and upland areas flanking it. It is divided into the Upper Fraser Valley and Lower Fraser Valley by the Vedder River mouth at the eastern foothills of Sumas Mountain, although the Lower Valley section upstream of McMillan Island and the Salmon River mouth (at Fort Langley) used to be called the Central Fraser Valley up until 1995 (see Central Fraser Valley Regional District).

Administratively, the Fraser Valley comprises parts of the regional districts of Metro Vancouver and the Fraser Valley Regional District. The main population centres in the Fraser Valley are Greater Vancouver, Abbotsford and Chilliwack.

This section of the Fraser River is known by local indigenous peoples as "Sto:lo" in the Halqemeylem language of the area, and this term has been adopted to refer to all of the indigenous peoples of the Fraser Lowland, other than the Squamish and Musqueam. The indigenous peoples of the area have long made use of the river valley for agricultural and commercial exploits and continue to do so today.^[when?]

The Indigenous people were not consulted in the Treaty of Oregon, which saw the United States and Great Britain define and recognize each other's claims to the area. This overstepping of jurisdiction inevitably led to conflict as Great Britain was incapable of exercising the control they claimed over the river valley. As a wave of immigrants flooded into the Fraser River Valley because of the Fraser Canyon Gold Rush, the British were unable to maintain order without the cooperation of the local indigenous peoples, and the Fraser Canyon War broke out. The war was resolved with a series of treaties, none of which remain to this day, but which evidently included the regulation of immigration and the continuation of mining on the river by the indigenous inhabitants and the new immigrants. This war was part of a series of local conflicts surrounding the arrival of settlers ahead of American and British capacity to maintain order and refusal to cooperate with or recognize indigenous land claims and demands. These conflicts were pivotal in many aspects to the settlement of the West Coast in both Canada and the United States.

The interaction of indigenous peoples and settlers led to the growth of Chinook Wawa, a pidgin language that was used throughout the Fraser River Valley until the early 1900s. Industrialization of the river began with the use of the traditional trade waterway by steamboats and eventually, roads and railways were built, fueled by and in turn fuelling further population growth. Today,^[when?] the most important transportation through the region are the Canadian Pacific Railway and Canadian National Railway transcontinental main lines, the Lougheed Highway (Hwy 7), and the Trans-Canada Highway (Hwy 1).

After descending through the rapids of the Fraser Canyon, the Fraser River emerges almost at sea level at Yale, over 100 km inland. Although the canyon in geographic terms is defined as ending at Yale, Hope is generally to be considered the southern end of the canyon, partly because of the change in the character of the highway from that point, and perhaps also because it is at Hope that the first floodplains typifying the course of the Lower Fraser are found. Downstream from Hope, the river and adjoining floodplains widen considerably in the area of Rosedale, Chilliwack and Agassiz, which is considered the head of the Fraser Delta. From there the river passes through some of the most fertile agricultural land in British Columbia—as well as the heart of the Metro Vancouver region—on its way through the valley to its mouth at Georgia Strait.

During the last ice age, the area that would become the Fraser Valley was covered by a sheet of ice, walled in by the surrounding mountains. As the ice receded, land that had been covered by glaciers became covered by water instead, then slowly rose above the water, forming the basin that exists today. The valley is the largest landform of the Lower Mainland ecoregion, with its delta considered to begin in the area of Agassiz and Chilliwack, although stretches of floodplain flank the mountainsides between there and Hope.