Water Supply
Rain Vs. Snow [Part 3]
Water use + management in the Henry’s Fork watershed have much larger effects on streamflow than any changes due to precipitation type.
Rob Van Kirk
March 6, 2024
Research and Monitoring
HFF Discovers Island Park Reservoir is the Center of the Universe
In recent years, HFF has expanded its work beyond the Caldera. Why? All roads lead to Island Park Reservoir, the center of the universe.
Christina Morrisett
March 6, 2024
Water Supply
Rain Vs. Snow [Part 2]
When snow makes up a larger fraction of total precipitation, prediction of irrigation-season water supply is more precise
Rob Van Kirk
March 5, 2024
Water Supply
Rain Vs. Snow [Part 1]
All precipitation is not created equal. Water supply is lower when a greater percentage of our precipitation falls as rain instead of snow.
Rob Van Kirk
March 4, 2024
Water Supply
Measuring streamflow on the Henry’s Fork: Why, Where, and How
In 2018, the Henry’s Fork Foundation began its Precision Management program. The motto for this program is “every drop, every day,…
Christina Morrisett
December 7, 2023
Water Supply
New Research by HFF Scientists and Interns
Summary. New research by HFF scientists and interns demonstrates how adopting center-pivot sprinkler irrigation over the last 40 years…
Christina Morrisett
September 20, 2023
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
Water Quality
FAQ: Water Temperatures on the Henry’s Fork
The Henry’s Fork is unique in that summer water temperatures between Island Park Dam and Pinehaven are affected more by air temperatures…
Jasper Davis
July 12, 2023
Water Quality
FAQ: IRRIGATION
Why do you sometimes see fields being irrigated (watered) while it is raining? Isn’t this a waste of valuable water? This question is…
Jasper Davis
July 10, 2023
Fisheries
FAQ: The South Fork Initiative
If the Henry’s Fork Foundation (HFF) is doing work on the South Fork, doesn’t that take away from the Henry’s Fork? This is absolutely a…
Jamie Powell
June 22, 2023
Water Supply
Understanding SWE and Snowpack in Winter
What is Snow-Water Equivalent (SWE)? When it comes to how snow will benefit the river, looks can be deceiving. That’s why we report…
Jamie Powell
January 12, 2023
Fishing
The Shrine of the Green Drake
What do you say when your best friend calls and asks you to be part of a plan he hatched for his daughter’s sixteenth birthday? His gift to her, in abstract, was a fishing experience that would be forever connected to this milestone day. I was asked to be part of the expedition because my friend is a novice angler with no knowledge or experience fishing the Henry’s Fork River.
Henry's Fork Foundation
December 28, 2022
Fishing
When does the river freeze in winter and does ice affect trout?
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…
Jamie Powell
October 27, 2022
Water Supply
Changes to Lower River Management Benefit Upper River
Highlights: The lower river between St. Anthony and Parker is an important summer management lever for Island Park Reservoir. The Drought…
Christina Morrisett
October 6, 2022
Fisheries
How Drought Affects the Henry’s Fork: A unique case among western rivers
What is the state of the drought in the Henry’s Fork Watershed? As of early April, water year precipitation sat at 79% of average (21%…
Jamie Powell
May 3, 2022
Water Quality
What Do Macroinvertebrates (Aquatic Insects) Tell Us About the Henry’s Fork?
Highlights Aquatic macroinvertebrates—insects and other creatures that live in the stream bottom—feed trout and are the basis of…
Rob Van Kirk
April 8, 2021
Water Quality
Winter Flow Shows Increasing Trend
Winter flow at Island Park Dam is the single biggest management factor determining trout recruitment in the Henry’s Fork downstream of…
Rob Van Kirk
December 30, 2020
Fisheries
The Paradox of Irrigation Efficiency
Diversion from the Henry’s Fork has decreased 30% over the past 40 years, yet consumptive use of water by crops has increased, there is…
Rob Van Kirk
December 10, 2018
Fisheries
Timing of snowmelt: Why is it Important and What Do We Know About it?
Timing of snowmelt runoff affects river ecology, trout behavior, fishing experience, and mid-summer streamflow in natural and regulated…
Rob Van Kirk
March 19, 2017
Fisheries
Winter on the Henry’s Fork: Flow, Temperature, and Trout
By Christina Morrisett and Rob Van Kirk During the Thanksgiving Holiday, we received a number of calls from concerned anglers about low…
Christina Morrisett
December 4, 2015