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Tuesday, December 16th, 2025

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Minnesota DNR completes aerial surveys of northeastern trout streams

Much of what DNR fisheries crews watch for during the fall surveys, conducted via helicopter, is the handiwork of local beavers, whose dams can block fish passage and disrupt reproductive efforts of trout species. (Photo courtesy of National Park Service)

Each year, the Duluth and Hinckley area fisheries offices work with Minnesota DNR pilots to traverse miles of riverways to locate any blockages that may inhibit natural trout movement.
This year’s helicopter surveys just wrapped up in the northeast at the Knife River.
“It’s our longest-running survey, as far as the helicopters are concerned. … It’s pretty critical for the trout,” DNR pilot Grace Zeller said.

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