Henry’s Fork, July 12th, 2022
Headlines from Dr. Rob Van Kirk’s latest water report for the Henry’s Fork follows.
Headlines:
- Mean temperature yesterday was 2 degrees F above average; water-year precipitation stands at 90% of average.
- Natural flow dropped another 3% yesterday, while diversion increased to 99% of average. Water rights priorities are near the median for the date.
- Outflow from Island Park Reservoir was increased to 1460 cfs yesterday to accommodate increased diversion into the Crosscut Canal.
- Diversion and reservoir outflow will remain high for the next 2-3 weeks, as hot, dry weather continues.
Rob Van Kirk, Ph.D.
Senior Scientist
P.O. Box 550
Ashton, ID 83420
208-881-3407 CELL
208-652-3568 FAX
Evenings ( try caddis and PMD and gray drake spinner patterns) and early AMs ( spinner patterns again) are the best times to fish the lower river where terrestrial insects are beginning to appear in good numbers. A bit early for these along the upper river except ant and beetle patterns should always be in that fly box Variable flow out of Island Park Reservoir impacts fishing from Box Canyon to Riverside. PMDs, Flavs and green drakes are diminishing a bit (AM and PM spinner falls bring action) except for PM brown drakes in lower Harriman offering best activity. PM caddis activity is reliable everywhere.