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.

Frequently Asked Questions: Turbidity in Island Park Reservoir Outflow

Rob Van Kirk

Aug 11

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...

77 views

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

Jamie Laatsch

May 3

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%...

323 views

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

Rob Van Kirk

May 3

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...

384 views

Jamie Laatsch

Jan 19

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...

178 views

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

Rob Van Kirk

Jan 7

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...

127 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%...

107 views

Rob Van Kirk

Apr 13, 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...

1 view

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...

7 views

Rob Van Kirk

Oct 14, 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...

2 views

Predicted 2020 Water Supply Near Average

Rob Van Kirk

Apr 2, 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 11, 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

Water Supply Above Average for 3rd Consecutive Year

Rob Van Kirk

Apr 10, 2019

Water Supply Above Average for 3rd Consecutive Year

Record precipitation in February moved snowpack from 80% of average on February 1 to 110% of average on April 1. Watershed-wide natural...

1 view

Water Year 2018: Average Supply but Above-Average Reservoir Carryover

Rob Van Kirk

Oct 6, 2018

Water Year 2018: Average Supply but Above-Average Reservoir Carryover

Water-year 2018 ended up close to average, at 102% of average precipitation and 105% of average streamflow. Upper Henry's Fork...

4 views

Streamflow and Reservoir Predictions for Summer 2018

Rob Van Kirk

May 9, 2018

Streamflow and Reservoir Predictions for Summer 2018

Cool, wet weather from mid-February to mid-April turned an average water supply into one that is decidedly above average. As of May 9,...

1 view

Water Year 2017: Precipitation 138% of Average, Streamflow 109% of Average

Rob Van Kirk

Oct 6, 2017

Water Year 2017: Precipitation 138% of Average, Streamflow 109% of Average

Water year 2017 was above average in both precipitation and streamflow. Averaged over the whole watershed, precipitation was 138% of...

4 views

Summer 2017 Streamflow Predictions: Much Better than 2016

Rob Van Kirk

Apr 21, 2017

Summer 2017 Streamflow Predictions: Much Better than 2016

To provide streamflow information for all river stakeholders, we have constructed a computer simulation model of the Henry’s Fork...

7 views

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