In addition to assisting with the railway surveys, Dewdney worked for the province of British Columbia exploring and building trails through the southern province. Dewdney and A.B. Rogers were partners in a trail building contract through the southern interior from Hope to Cranbrook, now called the 'Dewdney Trail' in 1865.
He went on to politics being elected to the B.C. legislature and then the Canadian parliament. He also served as Lieutenant Governor for the Northwest Territories and for British Columbia.
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