RedactedNarrative: Vessel 1 was headed upstream just north of the HWY 84 Bridge on Mississippi River when vessel 2 also headed upstream was crossing from west bank to east bank striking vessel 1 on the port side causing excessive damage to the port side and top rail.  Vessel 1 damage estimated at $4,000.  Vessel 2 had excessive to starboard bow and broken motor mount estimated at $8,000.  Vessel 1 operator complained of injury to left shoulder and operator of vessel 2 complained of injury to his lower legs. Both operators refused treatment.