Warmer and drier conditions have slowly degraded water quality in Island Park Reservoir over the last 50 years. In the 1970s and 1980s, federal reports
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
Every year since 2017, the Henry’s Fork Foundation Science and Technology Team has produced an annual technical report that documents all of our data collection
Are aquatic insects actually declining? Not in the way many anglers might think. After 11 years of data collected across six sites on the Henry’s
To address angler concerns about decreased hatches, particularly at Last Chance and the upper Ranch, and holistically assess ecological function throughout the mainstem Henry’s Fork,
In a first-of-its-kind adaptive science effort for the Henry’s Fork, the Idaho Department of Fish and Game (IDFG) and Henry’s Fork Foundation (HFF) are launching
Visual abstract for the 2025 HFF Membership Meeting created by Teddy Montalvo, 2025 Baucus Climate Scholar On June 19, we gathered at the Boys House
Fish ladder at the Buffalo River hydroelectric facility Streamflows are rising, bugs are hatching, and rainbow trout from Riverside to Island Park Dam are on
What is HFF’s Daily Water Report? After the severe drought of 2016, which resulted in what is still the poorest water quality we have recorded
PMDs were one of the hot topics on the Henry’s Fork in 2024, so here’s a few excerpts from the 10 Year Insect Report just
As most of you know, I started fishing the Harriman Ranch reach of the Henry’s Fork in 1977. I worked for Henry’s Fork Anglers from
To address angler concerns about decreased Henry’s Fork hatches, particularly at Last Chance and the upper Ranch, and holistically assess ecological function throughout the mainstem
It’s never a happy feeling reporting on tough conditions. And it feels like—when it comes to snowpack and water supply for our Western fisheries—it’s been nothing but tough conditions lately. While we wish we could say we’re immune, the Henry’s Fork has not escaped these dry conditions.
Thank you to all of those who attended this year’s annual Henry’s Fork Watershed Council tour! Participants toured the Last Chance…
Fremont County operates a wastewater treatment facility (WWTP) on Forest Service ground in Last Chance. With the continued growth of…
Summertime outflow from Island Park Reservoir is lower (not higher) than it was in the “glory days”.
Do water temperatures on the Henry’s Fork get too hot to fish and should there be hoot owl closures?
To help anglers plan their fishing day, the HFF launches a new way to visualize water clarity by showing how “brown” the river might be.
In recent years, HFF has expanded its work beyond the Caldera. Why? All roads lead to Island Park Reservoir, the center of the universe.
In 2018, the Henry’s Fork Foundation began its Precision Management program. The motto for this program is “every drop, every day,…
This information was first published in an HFF blog by Christina Morrisett and Rob Van Kirk in 2015. When does the river freeze? As far…
Highlights: The lower river between St. Anthony and Parker is an important summer management lever for Island Park Reservoir. The Drought…
Highlights Aquatic macroinvertebrates—insects and other creatures that live in the stream bottom—feed trout and are the basis of…
