Based on the statements of B1, Operator and other passengers coupled with the evidence it is more likely than not the following events occurred: 

DR1 was traveling East bound on the Spokane River approximately 1 mile East of Templins Marina. DR1 struck a submerged deadhead. The collision caused the drive shaft and propeller to be pulled off the boat causing the boat to take on water. 

There were 8 passengers were on the vessel at the time of the accident. 

DR1 was traveling westbound, collided with a submerged deadhead. DR1 was then towed by an unknown boat to Templins Marina where multiple water pumps were used to keep the boat from sinking until we were able to get it on a trailer.
SPOKANE RIVER
POST FALLS                    