Aquatic Insects
Fish of the Month: Year 11
As it is the afternoon of December 31, I am closing the year with my annual fish-of-the-month blog, this one at the end of my
Rob Van Kirk
December 31, 2025
Fishing
Fishing
River Guardian Spotlight: Tom and Doris Squeri
Written by Doris Squeri Tom and I met on our first day of grad school back in 1982. We were both broke and stressed, and
Jamie Powell
December 8, 2025
Fishing
From the Henry’s Fork to the One Fly: A Legacy Comes Full Circle
Guest Article by Mike Lawson, Henry’s Fork Anglers In early September, the Eagle Rock Wranglers, consisting of my youngest son, Chris, Mark Rockefeller (the owner
Jamie Powell
November 12, 2025
Research and Monitoring
Pilot Relocation of Wild Rainbows Demonstrates Adaptive Science to Strengthen the Henry’s Fork Fishery
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
Jamie Powell
October 10, 2025
Frequently Asked Questions
Turbidity FAQ – Fall 2025
What is the current climate like in the Henry’s Fork Watershed? We have seen warmer temperatures and less water as a whole in water year
Jasper Davis
September 9, 2025
Fishing
Henry’s Fork Summer Fishing: Predictions for water supply and water quality in 2025
This time of year, one question is top of mind: what can we expect from the summer fishing season on the Henry’s Fork? Every spring
Rob Van Kirk
April 14, 2025
Frequently Asked Questions
Island Park Winter Flow in 2025: How did we do?
Looking downstream from Island Park Dam on January 6, 2025 after a fresh snowfall. How did Island Park winter flow shape up in 2025? Winter
Rob Van Kirk
March 7, 2025
Fisheries
How Much Snow Does Henry’s Fork Need for Average Streamflow?
And what does “average” mean, anyway? Now that we are about 75% of the way through the snow accumulation season, we have enough information to
Rob Van Kirk
February 21, 2025
Aquatic Insects
PMDs on the Henry’s Fork
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
Jamie Powell
February 19, 2025
Water Quality
Water Year 2024 Technical Report
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
Rob Van Kirk
February 10, 2025
Education and Outreach
Free Island Park Reservoir Map
Background This blog is a how-to for use of a new free bathymetric (depth) and recreation map of Island Park Reservoir. The map is intended
Jack McLaren
January 28, 2025
Fishing
Fish of the Month: Year 10
The fish-of-the-month tradition started decades ago with my fishing buddy Tom Grimes, who has guided for Henry’s Fork Anglers all of those decades. I’ve had a couple of good multi-year runs over the decades, but this one beats them all…120 consecutive months!
Rob Van Kirk
January 8, 2025
Research and Monitoring
Island Park Reservoir Winter Flow Update
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.
Jasper Davis
December 11, 2024
Fisheries
Can We Improve Water Quality on Island Park Reservoir?
This is the 3rd blog in a series about research and conservation activity in the Upper Henry’s Fork, focusing on Island Park Reservoir….
Jack McLaren
September 26, 2024
Fisheries
ISLAND PARK RESERVOIR 101: HOW IT WORKS
This is the 2nd blog in a series about research and conservation activity in the Upper Henry’s Fork, focusing on Island Park Reservoir. …
Jack McLaren
September 24, 2024
Fisheries
What’s Island Park Reservoir Good for Anyways?
This is the 1st blog in a series about research and conservation activity in the Upper Henry’s Fork, focusing on Island Park Reservoir….
Jack McLaren
September 24, 2024
Fishing
Why aren’t I seeing any big fish in the Ranch? Is it because of the bugs?
Why aren’t anglers seeing big fish in the Ranch? Are hatches changing?
Jamie Powell
September 12, 2024
Research and Monitoring
FAQ: Is it Too Warm to Fish? Water Temperatures on the Henry’s Fork
Do water temperatures on the Henry’s Fork get too hot to fish and should there be hoot owl closures?
Jamie Powell
August 31, 2024
Fisheries
HFF Submits Comments on Henry’s Lake Flats Development
A continuation of the discussion around a proposed “airpark” and new Marriott in Henry’s Lake Flats.
Jamie Powell
August 24, 2024
FAQ: River Access and Recreation Regulations
Information about invasive species stickers, watercraft registration, outfitter licenses, and river recreation regulation.
Christina Morrisett
August 19, 2024
Fisheries
Organic Matter Causing Major Turbidity and Low Oxygen in Island Park
UPDATE: After 10 years of studying Island Park Reservoir, we thought we had seen just about everything possible, but the current event is…
Jamie Powell
August 2, 2024
Fisheries
Mick & Mike Talk Henry’s Fork in the 1980s (VIDEO)
Mick Mickelson and Mike Lawson talk about the 1980s and what prompted the formation of the Henry’s Fork Foundation in 1984.
Jamie Powell
June 26, 2024
Aquatic Insects
How Does HFF Calculate Hatch Timing?
Rather than a typical “hatch chart”, HFF’s hatch timing calculations are based on accumulation of thermal units in the aquatic ecosystem….
Jamie Powell
June 20, 2024
Fishing
Macrophyte FAQ
Throughout August-September, there tends to be a lot of rooted aquatic plant (macrophyte) growth. These plants grow rapidly as they…
Jasper Davis
August 31, 2023