RedactedNarrative: Unit 1 and unit 2 were north bound on the AZ side of the river.  Unit 2 stalled and the driver of unit 1 was unable to see due to water splashing in his eyes.  Unit 2 drifted sideways and the driver of unit 1 attempted to turn to the port side but was unable to avoid striking unit 2.  V2 operator was struck by v1, suffering injury.  He was ejected from the vessel.