Nicola Bulley, 45, was last seen walking her dog by the Wyre River in St Michael’s on Wyre, in Lancashire, on January 27.
Her phone, which was connected to a work call, and her dog leash, were found on a steep bank overlooking the river.
Police have said they believe Bulley fell into the river in unsuspicious circumstances.
But divers searching the area of the Wyre it was believed Bulley fell into have found no trace of her, the BBC has reported.
”We’ve done very thorough searches all the way down to the weir. Police divers have dived it three times, extremely thoroughly,” Peter Faulding of Specialist Group International – the body that supplied the divers – said.
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He said he could “guarantee” that if Bulley had been in that part of the river, she would have been found.
Officers are currently following hundreds of lines of inquiry.
The physical search has now been extended to other parts of the river.
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