HENRY'S FORK FOUNDATION | SEPTEMBER 2020
 
 
 
 
WHY HAVE INSECT HATCHES IMPROVED IN 2020?

Following three good years of winter flow, we all expected to see large numbers of 3-year old fish (14-18 inches long) in the river between Island Park Dam and Riverside campground this summer. What was less expected this year was the dramatic improvement in aquatic insect hatches observed and reported by many anglers who have fished the Harriman Ranch and adjacent river reaches regularly for decades. We have heard reports that some hatches have been as good or better than they were in the 1980s and certainly better than anything seen in recent years.

Senior Scientist Rob Van Kirk investigates some potential factors the could be affecting hatches in his latest blog, including:

  • Percent mayflies, stoneflies, and caddisflies in invertebrate samples at Osborne Bridge averaged 57% in 2019, compared with 41% during and after the recent drought and 17% in 1993.
  • A high springtime freshet and low irrigation-season outflow from Island Park Reservoir, as occurred in 2018-2020, accelerates transport of sediment out of the Harriman reach.
  • In the long run, net sediment transport out of the river between Island Park Dam and Pinehaven is around 1,600 tons per year. At that rate, 45-90% of the sediment deposited during the 1992 event has been removed to date.

Read the full blog here.
 
 
 
 
 
SFI ASSISTS IDFG WITH MONITORING ON RAINEY CREEK

Last month, HFF South Fork Initiative (SFI) Program Manager Bryce Oldemeyer assisted the Idaho Dept. of Fish and Game (IDFG) with electrofishing surveys and aerial drone surveys on sections of Rainey Creek. These surveys allow IDFG and partners to collect data on fish abundances and habitat in reaches of Rainey Creek before and after restoration work to better assess the impact of the restoration efforts. For example, last year, IDFG, HFF, and partners were able to quantify a 10-degree F decrease in August water temperatures and a 51 trout increase in fish population in a restored reach of Third Creek.

To support the South Fork Initiative and restoration work, click here and to read more about the Third Creek project, click here
 
 
 
 
 
HENRY'S FORK FOUNDATION 2020 PHOTO CONTEST WINNERS

Congratulations to HFF’s 2020 photo contest winners and thank you to all those who participated! Be on the lookout for more photos from our photo contest in HFF communications throughout the year!

Grand Prize Winner: Kristopher Kennedy

Category Winners:
    Fish/Fishing: William Teuscher
    People: Patrick Wilder
    Scenic: William Teuscher
 
 
 
 
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