Potomac River sets record temperature during blistering heat wave, contributing to large fish kill

Potomac River sets record temperature during blistering heat wave, contributing to large fish kill

The East Coast's Fourth of July heat wave drove the Potomac River north of Little Falls, Maryland, to a record temperature, contributing to a large fish kill, officials said. The Maryland Department of the Environment said one of its biologists recorded a water temperature of 94 degrees on July 4, while data from the USGS shows water temperatures peaking at 98.4 degrees.