Back to today’s briefing

Story perspectives

Study: River Heat Waves Surge, Threatening Cold-Water Species

9/23/2025

35 6

Summary

Story summary

A study of 1,500 U.S. river locations over 40 years finds rising river heat waves.
Heat waves in rivers are rising faster than air heat waves, threatening cold-water species.
Drivers include human-caused climate change, dwindling snowpack, and urban development.
Since 1980, 1.8 more heat-wave events per year and 0.8°F higher temperatures; researchers seek awareness on water quality.

1 of 1

Story summary

A study of 1,500 U.S. river locations over 40 years finds rising river heat waves.
Heat waves in rivers are rising faster than air heat waves, threatening cold-water species.
Drivers include human-caused climate change, dwindling snowpack, and urban development.
Since 1980, 1.8 more heat-wave events per year and 0.8°F higher temperatures; researchers seek awareness on water quality.