Before we lost the lake : a natural and human history of Sumas Valley

"For thousands of years, the broad expanse between Sumas and Vedder Mountains east of Vancouver lay under water, forming the bed of Sumas Lake. As recently as a century ago, the lake's shores stood four miles across and six miles long. During yearly high water, the lake spilled onto the surrounding prairies; during high flood years, it reached from Chilliwack into Washington State. Then, through the 1920s, a network of dykes, canals, dams and pum...