Traveling north on north side of Houston Ship Channel approximately 300yds from channel and apprx. 600yds from spoil bank near Channel on or near Channel Marker 78.  My 23' Pro Line boat with my father and brother, we hit large unmarked dredge pipe at about 30 knots.  Dredge pipe was right at surface of water and was unmarked and unable to see.  Pipe was extended across channel from Dredge boat on south side of channel.  Pipe was clearly marked on south side with large bright orange markers (4-5 ft dia.)  There were at least 50+ markers on that side.  North side was UNMARKED.  Outboard engine hit pipe and stopped boat killing engine and cracking Transom in 4 places.  We reported accident to Coast Guard officer on boat in Kemah Ship Channel.  On 12/01/10 I spoke with CG Officer and he informed me to get a report from TPWL Dept. 

Operator Completed Report
Kemah                         