Brockville police say that by the time officers arrived around 1 a.m. Monday, the snake had slithered into an air vent and disappeared.
Police confirm they were called to the Haney Bypass, about 45 kilometres east of Vancouver, just after 3 a.m.
Fisheries and Oceans Lower Fraser area director Jennifer Nener says about 2.27-million sockeye are expected this year.
Insp. Dan Richardson of Peel Regional police tweeted around 9 p.m. that the force's main account had been hacked.
Ayanle Hassan Ali is already facing nine counts laid by Toronto police at the time of his arrest in March, but the RCMP said the terrorism offences are all in addition to those original charges.
NDP MP says she wants everyone to move on from the incident.