Photo #25
Photo #26
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Sumas Prairie is a flat, poorly drained area, only 5 to 10 m above sea level, between Sumas and Vedder mountains. Faults at the base of Sumas and Vedder mountains form a basin containing several hundred metres of sediments. The upper sediments are less than 10,000 years old and accumulated in an ancient lake. The historic remnant of this lake, known as Sumas Lake, covered an area of many square kilometres and existed until the 1920s, when it was drained to create new agricultural land. Were it not for dykes along the Fraser and Vedder (Chilliwack) rivers, this area would be flooded frequently. |
