Police said the bodies of 16-year-old Tala Farea and 22-year-old Rotana Farea, of Fairfax, were found around 2:30 p.m. Wednesday in the vicinity of 68th Street and Riverside Park.
Responding officers found the bodies laying on rocks near the river.
A missing child's poster said the women were last seen on August 24, but no photographs were included.
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A police source tells Eyewitness News the bodies were bound together with duct tape, with tape around their waists and feet, facing each other.
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Both were fully clothed, and there were no signs of trauma.
Sources believe the bodies washed ashore with the tide and stayed when the tide went out.
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The Medical Examiner's Office will determine the cause of death, and the investigation is ongoing.