This is a picture of damage at one of the marinas along route 105, not to far from the dam. I swiped this photo off the Sand Jacinto River Authority website, which now have a page dedicated to Hurricane Ike pictures. It's worth checking out at:
I have no idea how long the SJRA sill leave this page up but until they take it down, go put some eyetracks on hurricane damage 80 miles inland of Galveston. I don't know if the photos are in the public domain so it's probably safe to go ahead and assume that the SJRA owns the copyright.