Hazard in Mallard on the Main Salmon?

I got a call this morning from someone who got off the Main yesterday. He informed me that he had seen three boats that had long cuts on their left tubes after running the left side of Mallard. A fourth boat had a cut on their right tube. The fourth boat had done a 180 degree turn after the drop to watch duckies go through behind him.

I called the FS and the ranger I spoke with hadn't heard anything. He was going to pass it on to the River Rangers.

Has anyone else heard anything about Mallard in the last few days? We are launching on Sunday and would appreciate any additional information.