The Chilko River is a 75-kilometre (47 mi) long river in the Chilcotin District of the Central Interior of British Columbia, Canada, flowing northeast from Chilko Lake to the Chilcotin River. Its main tributary is the Taseko River.The Chilko is the Chilcotin River's main tributary. In fact at their confluence the Chilko River is quite a bit larger than the Chilcotin. It is also the main reason why the lower reaches of the Chilcotin are very silty.