Vessel #1 was traveling southbound on the Colorado River at approximately 50 miles per hour approaching Blankenship Bend.  According to the operator Operator, there were several personal watercraft heading the same direction spread out across the waterway.  As they approached the sand bar, Operator decided to attempt a pass on the left side of the PWCs.  In preparation for the pass, Operator moved his watercraft to the left.  Operator advised that he was paying attention to the PWCs and did not notice how close he was coming to the sand bar.  The watercraft ran aground on the shallow sand bar then lurched to the left ejecting all four persons onboard.  The watercraft then proceeded to roll over several times coming to rest up side down on the exposed portion of the sand bar.
As a result, passenger suffered a fracture to her upper spine.  The fracture was later deemed non-debilitating.
No one else was seriously injured.
Lake Havasu City, AZ