Henry’s Fork, July 19th, 2022
Terrestrial insect populations are building along banks throughout the length of the river as the variety of aquatic insects decreases. Begin thinking patterns for such as ants, beetles and hoppers anywhere you fish the river, and target holding water along vegetated banks. Some turbidity is present in waters released from Island Park Reservoir and this condition continues on downstream through the Harriman State Park section. Best fishing is during AM spinner falls and remaining mayfly activity during late afternoons. This” best fishing times comment” applies to the entire river. Upcoming speckled dun and trico activity will “revitalize” this.
If you fish the river below Ashton Dam, consider that the warmer the water, the tougher it is for fish to revive after being caught and released.
Headlines from Dr. Rob Van Kirk’s Henry’s Fork drainage water status report from yesterday follow.
Headlines:
- Mean temperature yesterday was 3 degrees F above average, and water-year total precipitation at 90% of average.
- Natural flow has dropped a little to 80% of average over the past few days, while diversion increased a little yesterday to 98% of average.
- At an outflow of around 1450 cfs, Island Park Reservoir is dropping at around 1700 ac-ft per day and is 81% full.
- Current system management continues to keep stream flow in the lower watershed very stable, and no large changes are anticipated in the short term.
Rob Van Kirk, Ph.D.
Senior Scientist
P.O. Box 550
Ashton, ID 83420
208-881-3407 CELL
208-652-3568 FAX
.