RedactedNarrative: Vessel 1 headed southbound in the river. The operator struck something and pulled into a slip nearby. Vessel 2 was docked and not underway. After checking his vessel for damage, operator of vessel 1 backed out of the slip and didn't anticipate the force of the current (2kts) and the wind (10kts). Vessel 1 collided with vessel 2. No injuries.