RedactedNarrative: Vessel 1 was floating down black river.  Vessel 1 struck a partially submerged tree, capsized and ejected operator 1 into the water.  Operator 1 was not wearing a pfd nor had a throwable device in vessel 1.  Operator 1 became pinned on the tree and later disappeared from view.  Operator 1 was recovered downstream, approx. 1 mile, on 05/19/19 at approximately 0830.