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

General

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

General

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

Water Quality

September 2026 Water Quality Forecast for Island Park

Photo of Island Park Reservoir taken Friday, August 28, 2026 The ingredients for green algae blooms, the primary culprit for turbid water in Island Park, stacked up one after the other earlier this spring. Warm air temperatures. Low streamflow. Long, sunny days. And an ice-free reservoir 30 days earlier than normal. At the Henry’s Fork Foundation, where we swim in water data daily, we braced ourselves for the water quality worst-case scenario: another summer with

Christina Morrisett August 31, 2026

Frequently Asked Questions

FAQ: Island Park Reservoir Water Quality

Island Park Reservoir on June 24, 2026 Questions answered in this article: Why are Island Park Reservoir levels so low this year? Is Island Park Reservoir hyper-eutrophic? Are silt and sediment building up behind the dam? Island Park Reservoir is the center of the Henry’s Fork universe. Reservoir water quality and quantity shape our fisheries, and your fishing experience. But after a warm winter and lower-than-average snowfall, we’ve received a lot of questions about

Christina Morrisett August 24, 2026