Henry's Fork FoundationJuly 2015

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Upcoming Events


Member Reception

Wednesday, July 29

6:30 to 8:30 p.m. at Three Rivers Ranch. Please RSVP to kristen@henrysfork.org or call (208) 652-3567.

Watershed Council Field Tour
Tuesday, Aug. 11
9 a.m. to 3 p.m. - Annual Henry's Fork Watershed Council field tour to the Teton Basin, hosted by Friends of the Teton River. 

Member Reception
Thursday, Aug. 13
6:30 to 8:30 p.m. at Henry's Fork Lodge. Please RSVP to kristen@henrysfork.org or call (208) 652-3567.

Conservators' Circle Celebration 

Friday, Aug. 28

1 to 6:30 p.m. - Day float on the Henry's Fork with Teton Regional Land Trust followed by reception co-hosted by HFF. Details to come.


San Francisco Reception

Fall Board Meeting

Friday, November 6

San Francisco, California

Henry's Fork as it flows through Harriman State Park


A high flow out of Island Park Dam will be necessary next week to test the turbines at the Chester hydro-power facility operated by Fall River Rural Electric. The increased flow is scheduled for July 21-23 to allow the testing to occur at Chester on July 22-24. Final figures for the flow will not be determined until Monday, July 20, as precipitation, irrigation demand, and water management flexibility will all play a role in determining how much water is necessary from Island Park Reservoir. Watch the HFF blog for more information.

You are invited

Two evening receptions hosted by the Henry's Fork Foundation, Three Rivers Ranch, and Henry's Fork Lodge are planned this summer for members to get acquainted, learn more about the organization, and see old friends. The first reception will be Wednesday, July 29, from 6:30 to 8:30 p.m. at Three Rivers Ranch. The second will be Thursday, Aug. 13, from 6:30 to 8:30 p.m. at Henry's Fork Lodge. Space is limited, so please RVSP to kristen@henrysfork.org or call us at (208) 652-3567.


Jack McLaren of IDEQ prepares to measure water quality in Island Park Reservoir with a continuous-recording sonde. Photo by Rob Van Kirk.

Plant Material Seems to be Cause of Cloudy Water Below Dam

In recent years, water delivered through the gates on the west side of Island Park Dam becomes cloudy toward the middle of the summer. This year, HFF, Idaho Department of Environmental Quality, and Idaho Fish and Game have been monitoring water quality at three locations below the dam and in the reservoir itself. Preliminary results show that the primary sources of the cloudy water are decaying plant and other organic matter that has been deposited on the reservoir bottom and algae growing in the reservoir. Because decay of organic matter on the reservoir bottom creates a zone of low oxygen concentration, we were concerned about low dissolved oxygen concentrations in the river downstream. However, turbulent flow through the outlet gates appears to oxygenate the water, and dissolved oxygen concentrations downstream have been very high. Delivery of algae and plant material from the reservoir will peak next week during the high-flow event described above and will then subside as reservoir outflow decreases. We will post a detailed report on Rob's blog in a few weeks, once we have laboratory results. 


Save the Dates
Field Tour, Conservator's Circle

Save the date for the annual Henry's Fork Watershed Council field tour, this year on Tuesday, Aug. 11. This year's tour of the Teton Basin will be hosted and guided by the Friends of the Teton River. Details will be emailed to council participants as they become available, and an agenda will be sent out the week prior to the tour.


Also save the date for the Conservator's Circle annual celebration on Friday, Aug. 28. Join the Teton Regional Land Trust for an afternoon float on the Henry's Fork, launching from Box Canyon, followed by a reception at TroutHunter co-hosted by the Henry's Fork Foundation. Watch for details in next month's Hatch.

New Staff Members Onboard at HFF

Melissa Muradian
Jamie Laatsch

Two more full-time staff members have started work at the Foundation headquarters in Ashton.


Melissa Muradian started work July 1 as post-graduate research associate. She will be working closely with the Foundation's senior scientist, Rob Van Kirk, on analysis of water-quality and fish population data. 


Jamie Laatsch joined the Foundation in July as the Conservation and Outreach Coordinator. 


Read more about them on our website.