Record precipitation in February moved snowpack from 80% of average on February 1 to 110% of average on April 1.
Watershed-wide natural streamflow for April through September is forecast to be 105% of average, compared with 104% of average in 2018.
Delivery of water from Island Park Reservoir is predicted to begin around July 1 and remain in the range of 800-1200 cfs during July and August.
Because of very good inflow, the reservoir is expected to end the irrigation season around 80% full, compared with 72% full in 2018.
Higher water levels in Island Park Reservoir have numerous, scientifically documented benefits to the Henry's Fork fishery, prompting HFF to continue to expand the number of methods we use to limit delivery of water from the reservoir.
Many already have a sense that Island Park Reservoir plays a significant role in water quality, streamflows, and the fishing experience downstream, but here are 4 key lessons learned about the reservoir since HFF's founding in 1984:
In honor of HFF’s 35th Anniversary, each week in March and April we will share significant findings or key facts we’ve learned about the river over the past 35 years. Get ready for a crash course in Henry’s Fork trout habitat, fish passage, macroinvertebrates, hydrology, Island Park Reservoir, water quality, economic value of fishing, and water management.