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Big brown trout are declining in one of Colorado’s iconic reservoirs. New fishing rules may be coming.

Regulations are under consideration for Dillon Reservoir, Blue River and Tenmile Creek

A cyclist rides on a bike path at Dillon Reservoir
A cyclist rides on a bike path at Dillon Reservoir near Frisco, Colorado, on July 1, 2023. (Photo by Patrick Traylor/The Denver Post)
DENVER, CO - NOVEMBER 8:  Elise Schmelzer - Staff portraits at the Denver Post studio.  (Photo by Eric Lutzens/The Denver Post)
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The brown trout population in Dillon Reservoir has declined in recent years, prompting state wildlife officials to consider stricter fishing regulations for the reservoir and seasonal closures on nearby waters where the fish spawn in the fall.
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