On 9/4/10 at approx. 1348hrs i was dispatched to fishers landing boat docks for a possible injury collision on the colroado river at martinez sandbar. I spoke witht he operator. He stated he was traveling northbound on the river south of martinez sandbar traveling through a narrow portion of the river. A vessel traveling southbound passed v1. Due to the wake, v1 pivoted up and then down as it passed through the wake causing one of the passengers seated at the bow of v1 to strike the railing located on the bow breaking the passangers arm. The oeprtaor stated his wife sustained a fracture on her left arm amd refused to be transported for further medical treatment. Operator stated there were 4 passangers on board and none were wearing life jackets at the time of the collsiion. Injured passanger refused medicla treatment and wa self transported to the hospital by a family member for further treatment. There was no evidence alcohol was a factor in the collision. Theere was no damage to the watercraft. No further action was taken.
YUMA                          