Vessel was on plane and traveling west on the Clearwater River (heading down river).  The operator was navigating through an area of swift water where there are numerous rocks and the river becomes very shallow.  The operator said he was unfamiliar with the Clearwater River.  The operator attempted to avoid some of the rocks but there were too many and he could not avoid striking several of them.  The boat began taking on water and he ran aground.  The operator and his passengers were able to get the boat to shore and tie off to a tree.
Peck                          