An appeal was issued for 34-year-old Victoria Taylor, who was last seen at an address in Malton at 9am on Monday, September 30.
North Yorkshire Police describes her as white, and approximately 5ft 6in height.
"She was last seen wearing blue jeans, a black Adidas original puffa jacket with white stripes down the sleeves and a grey Jack Wills hooded jumper," they added.
"Members of the public should expect to see an increased police presence in Malton. Today, searches of the riverbanks will take place by our specialist underwater search team."
Inspector Leanne Anderson from North Yorkshire Police added: "There are a range of enquiries taking place to try and locate Victoria.
"This is still a missing person enquiry, and the focus of our activity is within the Malton / Norton area.
"Extensive searches will take place today and I would urge members of the public in the Malton / Norton areas to remain vigilant and report sightings or pass information to police immediately on 101 or 999."
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