Watershed Council Tours Island Park Reservoir - Henry's Fork Foundation

Watershed Council Tours Island Park Reservoir

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Thank you to all of those who attended this year’s annual Henry’s Fork Watershed Council tour! Participants toured the Last Chance Wastewater Treatment Plant, Island Park Reservoir, and Island Park Dam. A special thank you to Fremont County, the City of Island Park, Forsgren Associates, Fall River Rural Electric Cooperative, and Fremont-Madison Irrigation District for sharing their knowledge on some great new projects in our watershed–like the DIRTT Plan and Last Chance WWTP upgrades.

Learn more about the Watershed Council here.

Learn more about the DIRTT Plan here.

Learn more about how Island Park Dam works and how it’s managed.

Learn more about Last Chance WWTP here.

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Recent Posts

Recent Posts

Water Quality

Breathing Easy: Oxygenation in Island Park Reservoir

This story was written by Audrey Hunter (2026 intern) and was originally published in the Fall 2026 Newsletter. It’s no secret that late summers on Island Park Reservoir haven’t been in perfect conditions in recent years. Warm, turbid, algae-filled water plague reservoir recreationists while diminishing water quality downstream. Cyclical algal blooms decrease water clarity and create less-than-ideal circumstances for the reservoir’s flora and fauna. What’s the solution? HFF’s DIRTT Plan. In-Reservoir Oxygenation Nutrients released from

Christina Morrisett September 23, 2026

Drone image of Island Park Dam taken on September 9, 2026

Frequently Asked Questions

Island Park Reservoir Outflow Plan (Updated 9/16)

Drone photo taken on September 9, 2026 The Henry’s Fork Drought Management Planning Committee met on Wednesday, September 16 2026 to develop an updated reservoir management strategy. Downstream of the Henry’s Fork watershed, lower-valley irrigation demand over the rest of the season is anticipated to be slightly lower than projected last week, so Island Park Reservoir and Grassy Lake (in the Fall River drainage) do not need to deliver any more water out of the

Christina Morrisett September 16, 2026

Frequently Asked Questions

FAQ: Island Park Reservoir Fall 2026 Strategy

This year has brought the Henry’s Fork watershed an extraordinary water-supply challenge. Natural flow is exceptionally low, and Island Park Reservoir is ending the summer at a near-record low level. But there is another important part of this story: we knew these conditions were coming, we planned for them, and water managers are managing the water we have as carefully as possible. HFF is one of the 6 official signatories to the Henry’s Fork Drought

Jasper Davis September 9, 2026

Water Supply

Island Park Reservoir Current Conditions (9/4/26)

Why is Island Park Reservoir getting so low? Simply put, this has been an exceptionally low-water year. There isn’t enough natural flow to meet all of the basin’s needs without drawing down reservoirs. Water managers are working together to deliver water that is legally owed downstream while preserving as much as possible for next year. What should anglers expect below Island Park Dam? As Island Park Reservoir drops too low for the hydropower plant to

Jasper Davis September 4, 2026