Henry’s Fork, August 29th, 2023

If you see flying ants anywhere along the river, you have found the insect that trout will be keying on for weeks to come. Be sure to have patterns for them in that fly box. Also hopper-dropper combinations seem to work wellanywhere on the river.

Headlines from Dr. Rob Van Kirk’s Henry’s Fork Drainage Water Status Report Filed Monday, August 28th.

• Last week was on the warm and wet side, keeping water-year total precipitation 109% of average.
• Natural flow and diversion have stayed relatively constant over the past few days; irrigation demand and lower-watershed streamflow targets are currently being met with little to no reservoir draft.
• At an average outflow of 565 cfs, Island Park Reservoir gained 807 ac-ft since Friday due to rain and is 62.6% full, compared with 51.2% full on average.
• Water temperatures over the past few days have been well above average; turbidity remains well below average but could increase at Island Park Dam late in the week.

Rob Van Kirk, Ph.D.

Senior Scientist

Henry’s Fork Foundation

P.O. Box 550

Ashton, ID 83420

208-881-3407 CELL

208-652-3568 FAX

[email protected]