8o degrees and 10-12 knots of wind on Boca Ciega Bay. On the final beat back to the club out on the wire, I was about to cross in front of a power boat. The power boat sped up to cross in front of me and as just I was crossing his stern I saw he was towing a section of floating dock. His wake completly obliterated the tow and I tried to head up to stop. But it was too late and I crashed into the dock breaking off the port hull at the crossbar. Luckily ,I only damaged my elbow but did not break it. Skipper survived, boat totaled.