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High air temperatures and dropping water levels are causing stream water temperatures to rise in Yellowstone National Park. This can be detrimental for fish, resulting in fish kills if temperatures rise high enough.

  • Gibbon River below Gibbon Falls
  • Firehole River below Keppler Cascades
  • Madison River

Water temperatures have exceeded 73 degrees in the Gibbon River and 78 degrees in the Firehole River for the past two weeks. Optimal water temperature for trout is 55 to 57 degrees.

Higher water temperatures decrease the amount of oxygen in the water. Non-native rainbow and brown trout can tolerate higher temperatures than native cutthroat and bull trout.

Montana Fish, Wildlife & Parks fishing restrictions kick in if water temperatures reach 73 degrees or higher for three consecutive days.

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