HENRY'S FORK FOUNDATION | AUGUST 2020
 
 
 
 
SPRING WEATHER'S IMPACT ON SUMMER WATER SUPPLY AND FISHING

The 3-month April-June period is the most critical in determining summer streamflow and need for reservoir draft, as it includes the period of peak snow accumulation and melt of that snowpack. Once the snowpack has melted, rain during mid-late June can have a large impact on early-summer streamflow, irrigation demand, and need for Island Park Reservoir draft. From a fishing standpoint, spring weather can have a large effect on water quality and timing and quality of aquatic insect hatches. Although April-June temperature was average this year, high variability resulted in three very warm periods that melted this year’s average snowpack 10 days earlier than average. Luckily, cold, rainy weather in the second half of June compensated for the early snowmelt and delayed need for Island Park Reservoir draft two weeks beyond what it would have been without the rain. As of mid-July, Island Park Reservoir was still 91% full, compared with 83% full on average, setting up a 4th consecutive year of above-average carryover and high winter flows.

Learn more by reading Senior Scientist, Rob Van Kirk’s full report here.
 
 
 
 
 
WHAT YOU MIGHT HAVE MISSED IN HFF NEWS

- The road over the old Ora Bridge has reopened as paving on the west side of the new bridge is now complete. Construction on the new bridge continues so please be cautious around construction equipment in that area.

- Ever wondered what exactly “cfs” means or how hydraulic and hydrologic are different? Stream Channel Habitat and Hydrology intern London Bernier (St. Lawrence University) has produced a glossary to explain these and many more terms that tend to pop up in HFF reports. Check out the glossary by clicking here.

- HFF staff and interns conducted snorkel surveys last month in support of Doctoral Research Associate Jack McLaren’s PhD research on the upper Henry’s Fork. The snorkelers look for fish and once they spot one, a rock marks the sport. The data collectors then take flow measurements, macrophyte coverage and height data, and record substrate size in the fish’s chosen habitat. Finally, a random point 6-12 meters away is selected and the same data is collected to compare the characteristics of the habitat the fish chose with habitat in a nearby location it did not choose.

- We hope you will join us virtually on August 22nd for this year’s Henry’s Fork Days celebration – Henry’s Fork Days XXXVI. HFF’s projects and programs would not be possible without your support. Click here to view auction items, learn more about the event, and register.
 
 
 
 
 
HFF DOCTORAL RESEARCH ASSOCIATES DISTINGUISH THEMSELVES OUTSIDE OF THE WATERSHED

Jack McLaren and Christina Morrisett are both Doctoral Research Associates at HFF and PhD candidates at Utah State University. Both have also distinguished themselves this year in university and professional settings. Earlier this year, Jack was recognized by Utah State University as the 2020 Robins Award Graduate Student Teacher of the Year for the course he taught on Fish Diversity. Just last month, Christina was featured on a Yale Climate Connections radio story where she discussed the benefits of aquifer recharge to late summer flows.

HFF is lucky to have such talented and dedicated researchers conducting their work here on the Henry’s Fork. To learn more about Jack’s research on the upper river, click here and to learn more about Christina’s work on the lower river, click here.
 
 
 
 
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VIRTUAL HF DAYS XXXVI - AUG 22
 
 
 
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PHOTO CONTEST ENDS AUG 15
 
 
 
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