Description: Samples were collected from the Bloody Run Creek watershed from 2021 to 2024 to assess the potential effects of a large cattle feedlot. Samples were analyzed for a variety of constituents associated with cattle production, including bacteria, antibiotic resistant bacteria, antibiotics, hormonally active chemicals, total estrogenicity, glyphosate, and aminomethylphosphonic acid.

Author: Kendra Markland (U.S. Geological Survey)*

Author Bio: Kendra Markland is a physical scientist at the U.S. Geological Survey Central Midwest Water Science Center in Iowa City, Iowa. She works on a variety of water quality and environmental health projects, including real-time and discrete data collection and water quality modeling.