Butler County Sheriff Craig Murphy said Thursday that his investigators will search the west bank of the river near Towanda on Saturday morning.
Investigators started looking for Adam Herrman late last year after getting a tip that he hasn't been seen since 1999. He disappeared while living at a mobile home park near the river with his adoptive parents, Doug and Valerie Herrman.
The Herrmans have said the boy ran away, and they didn't report it out of fear the state would take him and other children away from them.
This weekend's search will be the third of the river area.
(Copyright 2009 by The Associated Press. All Rights Reserved.)