Tributes have been paid to the two teenagers, with Tonibeth, from Barmston, Washington, being hailed as a hero.
Friends of the pair have been laying flowers on the riverbank and paying their respects.
Amy Bell, 13, said: "I knew Chloe, she was a fantastic girl and she did not deserve this at all."
Joss Richards, 13, who was in the same school class as Tonibeth, said: "I'm really devastated that she has gone."
One card left with flowers said: "RIP Tonibeth you are a hero."
Another left for Chloe said: "Heaven has gained a beautiful angel who will be greatly missed."
More top news
MSPs are expected to back Nicola Sturgeon's call for a second independence referendum in a vote at Holyrood on Tuesday.
Adele has said she may never tour again after saying she was "not good" at it and she feels "vulnerable" on stage.
British Cycling's Dr Freeman has told MPs that the controversial jiffy bag delivered to him in France contained only a common decongestant