11 June 2025 Low-oxygen conditions expected to impact 5,574-square-mile area Lane Simmons of the U.S. Geological Survey collects a water-quality sample at the Mississippi River at Baton Rouge, Louisiana (USGS 07374000). Credit: Scott Dennis, USGS. NOAA is forecasting this summer’s Gulf of America (formerly Gulf of Mexico) “dead zone” to be average-sized, covering approximately [...]