Accident occurred while transiting from a slip in the new boat harbor (slip I-8) to a slip in the old boat harbor (slip C-56) at dusk. Vessel was moving at approximately 2-3 knots. As vessel rounded final finger float (H Float) it collided with an unmarked obstacle approximately 50 feet out  from the end of H float. The obstacle was a barnacle encrusted steel piling overgrown with seaweed. There were no markings (no lights, no reflective tape etc) whatsoever on the piling to alert the navigator to a hazard to navigation. The dusk light rendered the piling impossible to see from the steering station.
Cordova