This species was found at 54 bioassessment sites, 0 rapid fish bioassessment sites, 21 fisheries assessment sites, and 0 fisheries presence-only assessment sites. In total, it was collected at 75 distinct sites, or 6.4% of the 1177 total sites monitored by the bioassessment program. It is the 53rd most commonly collected species.

The Flathead Catfish was collected in 74 bioassessment sampling sessions and 21 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 450 individual Flathead Catfish specimens, ranking it the #70 most collected fish.