The woman was found mostly naked with wet hair and claimed she had been in the water according to police.
Fresno Police sources confirmed to The Independent that the woman had been found walking on a road near a lake at around 3am on Tuesday, 4 April.
The woman was found about 3:15 a.m. walking in the middle of the street on Millerton Road (Friant Road) about a mile south of Table Mountain.
A driver passing by found an nearly fully naked woman walking in the middle of the street.
Some local Facebook users said she frequently visits a Starbucks in the area.
As Fox News notes, the woman does have two webbed toes on each foot, which could have led to her having some sort of mermaid nickname? She told them she was a mermaid and said her name was Joanna, reports CBS Sacramento. Police think she could be between 17 and 20 years old.
He said: 'We did go through records after fingerprinting her and we still did not come up with her identity'.
Local resident Karon Renwick said, "There are some odd things that happen up here".