Currents · Business · 2026-08-15
In 2024, managers deliberately cooled the Colorado River to protect the Grand Canyon from invasive smallmouth bass. 2 years later, no bass recruitment had been detected, but the effort cost $19.1 million in replacement power
Managers at Glen Canyon Dam used an unusual strategy to protect native Colorado River fish from invasive smallmouth bass: they deliberately cooled downstream water during periods when the fish could reproduce. The “Cool Mix” operation combined colder water from lower river outlets with water passing... Managers at Glen Canyon Dam used an unusual strategy to protect native Colorado River fish from invasive smallmouth bass: they deliberately cooled downstream water during periods when the fish could reproduce. The “Cool Mix” operation combined colder water from lower river outlets with water passing through power-generating penstocks, keeping temperatures near or below 60°F. No
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