This species was found at 55 bioassessment sites, 0 rapid fish bioassessment sites, 22 fisheries assessment sites, and 0 fisheries presence-only assessment sites. In total, it was collected at 77 distinct sites, or 6.4% of the 1196 total sites monitored by the bioassessment program. It is the 53rd most commonly collected species.

The Flathead Catfish was collected in 76 bioassessment sampling sessions and 23 fisheries assessment sessions. It was present in 0 rapid bioassessment sessions and 0 presence-only sessions.

The biological assessment program has collected a total of 501 individual Flathead Catfish specimens, ranking it the #70 most collected fish.