Water Supply

HFF BLOGS

Scroll through to read the most recent HFF Blogs and articles. Or click on the keywords at the top of the page to sort blogs and articles by topic.

Understanding SWE and Snowpack in Winter

Jamie Powell

Jan 12

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...

30 views

Jamie Powell

Jan 12

Top 10 for 2022

At the end of each year, the Henry's Fork Foundation (HFF) takes a moment to reflect back on some memorable events and accomplishments...

63 views

The Year 2022 in Review: Can you say "cold, wet spring?"

Rob Van Kirk

Jan 3

The Year 2022 in Review: Can you say "cold, wet spring?"

A cool, rainy sunset at Vernon Bridge in May. Climate. Peak snow water equivalent (SWE) was 71% of average and 3rd lowest in the...

98 views

When does the river freeze in winter and does ice affect trout?

Jamie Powell

Oct 27, 2022

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...

181 views

Jamie Powell

Oct 12, 2022

Programs and Impacts -- 2022

We continue to try to share as much information as possible in as many ways as possible, to try to reach everyone who might be...

86 views

Changes to Lower River Management Benefit Upper River

Christina Morrisett

Oct 6, 2022

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...

93 views

Water Year 2022 Summary: Natural Streamflow

Rob Van Kirk

Oct 3, 2022

Water Year 2022 Summary: Natural Streamflow

Headlines: Natural streamflow was 72% of average, ranking as the driest year in the 1978-2022 record. By subwatershed, natural flow was...

3 views

Rob Van Kirk

Oct 2, 2022

Water Year 2022 Summary: Climate

Headlines: Peak snow water equivalent (SWE) was 71% of average and 3rd lowest in the 1989-2022 record, but SWE peaked on April 24, 12...

4 views

Frequently Asked Questions: Turbidity in Island Park Reservoir Outflow

Rob Van Kirk

Aug 11, 2022

Frequently Asked Questions: Turbidity in Island Park Reservoir Outflow

Why is turbidity higher when flow comes out of the gates? Two dam outflow points: 1) original dam gates and 2) power plant siphon Gates...

110 views

How Drought Affects the Henry's Fork: A unique case among western rivers

Jamie Powell

May 3, 2022

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%...

338 views

Henry's Fork Water Supply: Lowest water supply since 2001 and possibly 1934

Rob Van Kirk

May 3, 2022

Henry's Fork Water Supply: Lowest water supply since 2001 and possibly 1934

Each spring, Dr. Rob Van Kirk analyzes water supply data for the water year so far (Oct 1 - April 1) to assess the water situation and...

391 views

Jamie Powell

Jan 19, 2022

HFF's Top 10 for 2021

At the end of each year, the Henry's Fork Foundation (HFF) takes a moment to reflect back on some memorable events and accomplishments...

190 views

Water Year 2021: Average reservoir carryover with a 2016 water supply

Rob Van Kirk

Jan 7, 2022

Water Year 2021: Average reservoir carryover with a 2016 water supply

Water year 2021 turned out to be as dry or drier than 2016 by most measures, yet Island Park Reservoir volume on September 30 was just a...

131 views

November Water Summary and Winter Strategy at Island Park Dam

Rob Van Kirk

Dec 1, 2021

November Water Summary and Winter Strategy at Island Park Dam

Headlines: The month of November was very warm but well short of the record. Precipitation for the month was 16% below average but is 8%...

112 views

Rob Van Kirk

Apr 12, 2021

Summer 2021 Predictions: Another 2016?

This is the 5th consecutive year I have predicted upcoming spring and summer streamflow conditions based on April-1 data, including...

4 views

Rob Van Kirk

Dec 30, 2020

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...

2 views

High Turbidity Headlines 2020 Water Quality

Rob Van Kirk

Nov 6, 2020

High Turbidity Headlines 2020 Water Quality

Temperatures were below average and highly variable during the spring but above average for most of August and September, reflecting air...

10 views

Rob Van Kirk

Oct 13, 2020

Water Year 2020: 92% of Average Supply

Climate: Record-breaking cold in October, a generally dry winter, a 9th-inning rally that brought snowpack up to average just in time for...

4 views

Predicted 2020 Water Supply Near Average

Rob Van Kirk

Apr 1, 2020

Predicted 2020 Water Supply Near Average

A cold, wet March brought snow water equivalent up to 97% of average, after it spent most of the winter down around 90% of average....

3 views

Water Year 2019: 3rd Year of High Reservoir Carryover

Rob Van Kirk

Oct 10, 2019

Water Year 2019: 3rd Year of High Reservoir Carryover

Climate: Record-breaking February snow, springtime temperature 2 degrees below average, and heavy precipitation in September. Mean...

3 views

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