water quality

A photo taken of Island Park Reservoir while standing on the dam and looking north. The sky is cloudy, Mt Sawtelle sits with little snow in the background, and the reservoir is open water (save for a few small sheets of ice in the distance).

Frequently Asked Questions

Reservoir Ices Off, Growing Season Turns On

Photo of an ice-free Island Park Reservoir taken on March 31, 2026 On March 31, 2026, with no accompanying commentary, HFF scientist Christina Morrisett stood

Christina Morrisett May 7, 2026

Drift boat with anglers rowing downriver surrounded by tall trees

Water Quality

The River Rundown: Your FAQs from June 2025

“It feels like July!” was a common sentiment shared around the watershed last month. Anglers enjoyed Brown Drakes on the Ranch three weeks earlier than

Christina Morrisett July 8, 2025

Reservoir Ices Off, Growing Season Turns On

The River Rundown: Your FAQs from June 2025

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