Water Quality
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
Water Quality
Water Quality
Estimation of Thurmon Creek sediment load following the drawdown of Silver Lake
In this blog post, we 1) present our turbidity and suspended sediment data, 2) explain our suspended load calculations, and 3) provide some additional information
Rob Van Kirk
December 10, 2025
Water Quality
Silver Lake Sediment Event: What Happened, What We Saw, and What We’re Doing About It
The Henry’s Fork Foundation (HFF) has become aware of, and is actively investigating, the recent draining of Silver Lake in Harriman State Park. The sudden
Jamie Powell
November 21, 2025
Water Quality
FAQ: Silver Lake Sediment Event
The Henry’s Fork Foundation (HFF) has become aware of, and is actively investigating, the recent drawdown of Silver Lake in Harriman State Park. The sudden
Jamie Powell
November 21, 2025
Water Quality
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
Frequently Asked Questions
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
Water Quality
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
Water Quality
Behind the Scenes of HFF’s Daily Water Report
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
Rob Van Kirk
March 7, 2025
Fishing
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
Research and Monitoring
Ten Years of Aquatic Insect Data from the Henry’s Fork: What have we learned?
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
Rob Van Kirk
January 31, 2025
Water Quality
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
Fisheries
$1 MILLION for Henry’s Fork DIRTT Plan
Can we improve hatches and the Ranch fishery? Meet the new DIRTT Plan.
Jamie Powell
October 2, 2024
Water Quality
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
Fishing
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
Water Quality
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
Water Quality
Last Chance Wastewater Treatment Plant Getting Ready for Upgrades
Fremont County operates a wastewater treatment facility (WWTP) on Forest Service ground in Last Chance. With the continued growth of…
Jamie Powell
September 11, 2024
Water Quality
Watershed Council Tours Island Park Reservoir
Thank you to all of those who attended this year’s annual Henry’s Fork Watershed Council tour! Participants toured the Last Chance…
Jamie Powell
September 11, 2024
Aquatic Insects
(2ND LOOK) 2023 Henry’s Fork Foundation Report
As summer transitions to fall, we’re reflecting back on where we were as of the start of the year. Originally published January 23, 2024….
Jamie Powell
September 3, 2024
Water Quality
State of the Henry’s Fork 2023: Water Year Technical Report
UPDATE: With only one month left in the 2024 water year, let’s take a look back at Water Year 2023, and get a preview of the types of…
Rob Van Kirk
August 30, 2024
Water Quality
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
Water Quality
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
Water Quality
Rain Vs. Snow [Part 5]
Increasing spring and summer air temperatures have a doubly negative affect on water quality.
Rob Van Kirk
March 8, 2024
Water Quality
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