RedactedNarrative: WC #1 was coming from St Louis Bay headed toward Excelsior Bay. WC #2 was coming from Big Island and heading toward Excelsior Bay. Operator #1 thought his boat was going parallel to WC #2. Operator #2 did not see WC #1 until the last second due to water conditions and crossing boat traffic. Both watercraft attempted to turn away and avoid the collision, but were unsuccessful. There was damage to WC #2. A lifejacket was being worn on WC #2 but not on WC #1. There were no injuries, and alcohol was not a factor.