“Fisheries and Oceans Canada is investigating the construction of a bridge over the Highwood River,” said department spokesman Rodney Drover in an email.
The river provides increasingly rare habitat for bull trout, Alberta's provincial fish and a threatened species subject to a federal recovery plan. The silt plugs up spaces between stream-bed gravels, home to the insects that trout eat, said Fitch. It also prevents oxygen-rich water from nourishing the eggs fish lay in those spaces.
Joshua Killeen, program manager for the society, said provincial officials are concerned enough about water levels and temperatures in the river to have limited fishing during parts of the day.
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